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330. D.-H. Kang, Y.-J. Park, Y.-S. Jeon, N.-G. Park, Extended X-ray absorption fine structure (EXAFS) of FAPbI3 for understanding local structure-stability relation in perovskite solar cells, Journal of Energy Chemistry, https://doi.org/10.1016/j.jechem.2021.10.028

329. S. Jeong, S. Seo, H. Yang, H. Park, H. Shin, H. Ahn, D. Lee, J.-H. Park, N.-G. Park, H. Shin, Cyclohexylammonium-based 2D/3D perovskite heterojunction with funnel-like energy alignment for efficient solar cells (23.91%), Adv. Energy Mater., 2021, 11, 2102236.

328. J.-M. Yang, Y.-K. Jung, J.-H. Lee, Y. C. Kim, S.-Y. Kim, D.-A. Park, J.-H. Kim, S.-Y. Jeong, S. Seo, J.-H. Park, I. Han, A. Walsh, N.-G. Park, Asymmetric Carrier Transport in Flexible Interface-type Memristor Enables Artificial Synapses with Sub-Femtojoule Energy Consumption, Nanoscale Horiz., 2021, 6, 987-997.

327. S.-Y. Kim, J.-M. Yang, S.-H. Lee, N.-G. Park, A layered (n-C4H9NH3)2CsAgBiBr7 perovskite for bipolar resistive switching memory with a high ON/OFF ratio, Nanoscale, 2021, 13, 12475-12483.

326. D.-K. Lee, N.-G. Park, Materials and Methods for High-Efficiency Perovskite Solar Modules, Sol. RRL 2021, 2100455.

325. J.-H. Kim, S.-G. Kim, N.-G. Park, Effect of Chemical Bonding Nature of Post-Treatment Materials on Photovoltaic Performance of Perovskite Solar Cells, ACS Energy Lett. 2021, 6, 3435−3442.

324. C. Ma, B. Kim, D.-H. Kang, S.-W. Kim, N.-G. Park, Nonchemical n- and p-Type Charge Transfer Doping of FAPbI3 Perovskite, ACS Energy Lett. 2021, 6, 8, 2817-2824.

323. M. Lyu, S. Park, H. Lee, B. S. Ma, S. H. Park, K.-H. Hong, H. Kim, T.-S. Kim, J. H. Noh, H. J. Son, N.-G. Park, Simultaneous Enhanced Efficiency and Stability of Perovskite Solar Cells Using Adhesive Fluorinated Polymer Interfacial Material, 2021, https://doi.org/10.1021/acsami.1c05822

322. G. S. Shin, J.-H. Kim, S.-U. Lee, N.-G. Park, Viscosity Blending Approach for 22.42% Efficient Perovskite Solar Cells, Bull. Korean Chem. Soc. 2021, 42, 8, 1112-1120.

321. J. Chen, N.-G. Park, Nonhalide Materials for Efficient and Stable Perovskite Solar Cells, Small Methods 2021, 5, 2100311.

320. H.-J. Kim, H.-S. Kim, N.-G. Park, Progress of Perovskite Solar Modules, Adv. Energy Sustainability Res. 2021, 2000051.

319. J.-W. Lee, N.-G. Park, Quasi-two-dimensional perovskite light emitting diodes for bright future, Light Sci. Appl. 2021, 10, 86.

318. D.-K. Lee, Y. Shin, H. J. Jang, J.-H. Lee, K. Park, W. Lee, S. Yoo, J. Y. Lee, D. Kim, J.-W. Lee, N.-G. Park, Nanocrystalline Polymorphic Energy Funnels for Efficient and Stable Perovskite Light Emitting Diodes, ACS Energy Lett. 2021, 6, 5, 1821–1830.

317. S.-H. Lee, S. Jeong, S. Seo, H. Shin, C. Ma, N.-G. Park, Acid Dissociation Constant: A Criterion for Selecting Passivation Agents in Perovskite Solar Cells, ACS Energy Lett. 2021, 6, 1612−1621.

316. S.-G. Kim, J.-H. Kim, P. Ramming, Y. Zhong, K. Schötz, S. J. Kwon, S. Huettner, F. Panzer, N.-G. Park, How antisolvent miscibility affects perovskite film wrinkling and photovoltaic properties, Nat Commun, 2021, 12, 1554.

315. O. Almora, D. Baran, G. C. Bazan, C. I. Cabrera, K. R. Catchpole, S. E.-Ela, F. Guo, J. Hauch, A. W. Y. Ho-Baillie, T. J. Jacobsson, R. A. J. Janssen, T. Kirchartz, N. Kopidakis, Y. Li, M. A. Loi, R. R. Lunt, X. Mathew, M. D. Mcgehee, J. M.,David, B. Mitzi, M. K. Nazeeruddin, J. Nelson, A. F. Nogueira, U. W. Paetzold, N.-G. Park, B. P. Rand, U. Rau, H. J. Snaith, E. Unger, L. Vaillant-Roca, H.-L. Yip, and C. J. Brabec, Reporting Device Performance of Emerging Photovoltaic Materials (Version 1), Authorea 2021.

314. I. S. Yang, N.‐G. Park, Dual Additive for Simultaneous Improvement of Photovoltaic Performance and Stability of Perovskite Solar Cell, Adv. Funct. Mater. 2021, 31, 2100396.

313. K. Jung, W.-S. Chae, Y. C. Park, N.-G. Park, M.-J. Lee, Amorphous AlO6–SnO2 nanocomposite electron-selective layers yielding over 21% efficiency in ambient-air-processed MAPbI3-based planar solar cells, Chem. Eng. J. 2021, 409, 128215.

312. S.‐G. Kim, T Huong Le, T. de Monfreid, F. Goubard, T.‐T. Bui, N.‐G. Park, Capturing Mobile Lithium Ions in a Molecular Hole Transporter Enhances the Thermal Stability of Perovskite Solar Cells, Adv. Mater. 2021, 33, 2007431.

311.P. Nandi, Z. Li, Y. Kim, T. K. Ahn, N.-G. Park, H. Shin, Stabilizing Mixed Halide Lead Perovskites against Photoinduced Phase Segregation by A-Site Cation Alloying, ACS Energy Lett. 2021, 6, 3, 837–847.

310. J.-W. Lee, S. Seo, P. Nandi, H. S. Jung, N.-G. Park, H. Shin, Dynamic structural property of organic-inorganic metal halide perovskite, iScience 2021, 24, 101959.

309. C. Ma, B. Kim, S.-W. Kim N.-G. Park, Dynamic halide perovskite heterojunction generates direct current, Energy Environ. Sci. 2021, 14, 374-381.

308. D.-K. Lee, K.-S. Lim, J.-W. Lee N.-G. Park, Scalable perovskite coating via anti-solvent-free Lewis acid–base adduct engineering for efficient perovskite solar modules, J. Mater. Chem. A 2021, 9, 3018-3028.

307. D.-H Kang, S.-Y. Kim, J.-W. Lee, N.-G. Park, Efficient surface passivation of perovskite films by a post-treatment method with a minimal dose, J. Mater. Chem. A 2021, 9, 3441-3450.
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306. Y. Zhang, N.-G. Park, A thin film (<200 nm) perovskite solar cell with 18% efficiency, J. Mater. Chem. A 2020, 8, 17420.

305. D. Li, D. Zhang, K.-S. Lim, Y. Hu, Y. Rong, A. Mei, N.-G. Park, H. Han, A Review on Scaling Up Perovskite Solar Cells, Adv. Funct. Mater. 2020, 2008621.

304. H.-S. Kim, N.-G. Park, Importance of tailoring lattice strain in halide perovskite crystals, NPG Asia Mater. 2020, 12, 78.

303. N.-G. Park, Green solvent for perovskite solar cell production, Nat. Sustain. 2021, 4, 3, 192-193.

302. M. Lyu, N.-G. Park, Effect of Additives AX (A = FA, MA, Cs, Rb, NH4, X = Cl, Br, I) in FAPbI3 on Photovoltaic Parameters of Perovskite Solar Cells, Sol. RRL 2020, 4, 10, 2000331.

301. C. Ma, N.-G. Park, Paradoxical Approach with a Hydrophilic Passivation Layer for Moisture-Stable, 23% Efficient Perovskite Solar Cells, ACS Energy Lett. 2020, 5, 10, 3268–3275.

300. P. Nandi, D. Topwal, N.-G. Park, H. Shin, Organic-Inorganic Hybrid Lead Halides as Absorber in Perovskite Solar Cells: A Debate on Ferroelectricity, J. Phys. D: Appl. Phys. 2020, 53, 493002.

299. J. Y. Kim, J.-W. Lee, H. S. Jung, H. Shin, N-G. Park, High-Efficiency Perovskite Solar Cells, Chem. Rev. 2020, 120, 15, 7867–7918.

298. J. Chen, N.-G. Park, Materials and Methods for Interface Engineering toward Stable and Efficient Perovskite Solar Cells, ACS Energy Lett. 2020, 5, 8, 2742–2786.

297. T.W. Kim, N.-G. Park, Methodologies for structural investigations of organic lead halide perovskites, Materials Today 2020, 38, 67-83.

296. H. Kim, J.S. Kim, J.-M. Heo, M. Pei, I.-H. Park, Z. Liu, H.J. Yun, M.-H. Park, S.-H. Jeong, Y.-H. Kim, J.-W. Park, E. Oveisi, S. Nagane, A. Sadahanala, L. Zhang, J.J. Kweon, S.K. Lee, H. Yang, H.M. Jang, R.H. Friend, K.P. Loh, M.K. Nazeeruddin, N.-G. Park, and T.-W. Lee, Proton-transfer-induced 3D/2D hybrid perovskites suppress ion migration and reduce luminance overshoot, Nat. Commun. 2020, 11, 3378.

295. D.-H. Kang, S.-G. Kim, Y.C. Kim, I.T. Hwan, H.J. Jang, J.Y. Lee, N.-G. Park, CsPbBr3/CH3NH3PbCl38 Double Layer Enhances Efficiency and Lifetime of Perovskite Light-Emitting Diodes, ACS Energy Lett. 2020, 5, 2191-2199.

294. C. Ma, N.-G. Park, A Realistic Methodology for 30% Efficient Perovskite Solar Cells, Chem. 2020, 6, 1254-1264.

293. S.-Y. Kim, J.-M. Yang, E.-S. Choi, N.-G. Park, Layered (C6H5CH2NH3)2CuBr4 Perovskite for Multilevel Storage Resistive Switching Memory, Adv. Funct. Mater. 2020, 30, 2002653.

292. G. S. Shin, Y. Zhang, N.-G. Park, Stability of Precursor Solution for Perovskite Solar Cell: Mixture (FAI + PbI2) versus Synthetic FAPbI3 Crystal, ACS Appl. Mater. Interfaces 2020, 12, 15167-15174.

291. N.-G. Park, K. Zhu, Scalable fabrication and coating methods for perovskite solar cells and solar modules, Nat. Rev. Mater. 2020, 5, 333-350.

290. M. V. Khenkin , E. A. Katz, A. Abate, G. Bardizza, J. J. Berry, C. Brabec, F. Brunetti, V. Bulović, Q. Burlingame, A. D. Carlo, R. Cheacharoen, Y.-B. Cheng, A. Colsmann , S. Cros, K. Domanski , M. Dusza, C. J. Fell , S. R. Forrest, Y. Galagan , D. D. Girolamo, M. Grätzel, A. Hagfeldt , E. Hauff,H. Hoppe, J. Kettle, H. Köbler , M. S. Leite , S. Liu, Y.-L. Loo, J. M. Luther, C.-Q. Ma , M. Madsen , M. Manceau, M. Matheron , M. McGehee , R. Meitzner, M. K. Nazeeruddin , A. F. Nogueira, Ç. Odabaşı , A. Osherov, N.-G. Park , M. O. Reese, F. D. Rossi, M. Saliba , U. S. Schubert , H. J. Snaith , S. D. Stranks , W. Tress , P. A. Troshin, V. Turkovic, S. Veenstra , I. V.-Fisher , A. Walsh , T. Watson, H. Xie, R. Yıldırım , S. M. Zakeeruddin, K. Zhu , and M. L.-Cantu, Consensus statement for stability assessment and reporting for perovskite photovoltaics based on ISOS procedures, Nat. Energy 2020, 5, 35–49.

289. N.-G. Park, Perovskite Solar Cell: Research Direction for Next 10 Years, ACS Energy Lett. 2020, 4, 12, 2983-2985.

288. H. S. Jung, G. S. Han, N.-G. Park, M. J. Ko, Flexible Perovskite Solar Cells, Joule 2020, 3, 1850–1880.

287. Y. Zhang, S. Seo, S.Y. Lim, Y. Kim, S.-G. Kim, D.-K. Lee, S.-H. Lee, H. Shin, N.-G. Park, Achieving Reproducibility and High Efficiency (> 21%) Perovskite Solar Cells with a Pre-synthesized FAPbI3 Powder, ACS Energy Lett. 2020, 5, 2, 360-366.

286. N.-G. Park, Research Direction toward Scalable, Stable, and High Efficiency Perovskite Solar Cells, Adv. Energy Mater. 2020, 10, 1903106.

285. D.-N. Jeong, J.-M. Yang, N.-G. Park, Roadmap on halide perovskite and related devices, Nanotechnology 2020, 31, 152001.
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284. J.-W. Lee, N.-G. Park, Chemical Approaches for Stabilizing Perovskite Solar Cells, Adv. Energy Mater. 2019, 10, 1903249.

283. S. Seo, H.S. Jung, P.J. Yoo, J.H. Park, D.-Y. Jung, H. Shin, N.-G. Park, Hot Scientific Debate on Halide Perovskites: Fundamentals, Photovoltaics, and Optoelectronics at Eighth Sungkyun International Solar Forum 2019 (SISF 2019), ACS Energy Lett. 2019, 4, 2475-2479.

282. D.-K. Lee, D.-N. Jeong, T.K. Ahn, N.-G. Park, Precursor Engineering for a Large-Area Perovskite Solar Cell with> 19% Efficiency, ACS Energy Lett. 2019, 4, 2393-2401.

281. J. Chen, X. Zhao, S.-G. Kim, N.-G. Park, Multifunctional Chemical Linker Imidazoleacetic Acid Hydrochloride for 21% Efficient and Stable Planar Perovskite Solar Cells, Adv. Mater. 2019, 31, 1902902.

280. H. Park, I. J. Park, M. G. Lee, K. C. Kwon, S.-P. Hong, D. H. Kim, S. A Lee, T. H. Lee, C. Kim, C. W. Moon, D.-Y. Son, G. H. Jung, H. S. Yang, J. R. Lee, J. Lee, N.-G. Park, S. Y. Kim, J. Y. Kim, H. W. Jang, Water Splitting Exceeding 17% Solar-to-Hydrogen Conversion Efficiency Using Solution-Processed Ni-Based Electrocatalysts and Perovskite/Si Tandem Solar Cell, ACS Appl. Mater. Interfaces 2019, 11, 33835-33843.

279. L. Xie, J. Chen, P. Vashishtha, X. Zhao, G. S. Shin, S.G. Mhaisalkar, N.-G. Park, Importance of Functional Groups in Cross-Linking Methoxysilane Additives for High-Efficiency and Stable Perovskite Solar Cells, ACS Energy Lett. 2019, 4, 2192-2200.

278. G. S. Shin, S.-G. Kim, Y. Zhang, N.-G. Park, A Correlation between Iodoplumbate and Photovoltaic Performance of Perovskite Solar Cells Observed by Precursor Solution Aging, Small Methods 2019, 4, 1900398.

277. Y. Park, J. Choi, C. Lee, A.-N. Cho, D.W. Cho, N.-G. Park, H. Ihee, J. Y. Park, Elongated Lifetime and Enhanced Flux of Hot Electrons on a Perovskite Plasmonic Nanodiode, Nano Lett. 2019, 19, 5489-5495.

276. T. Wu, C. Zhen, H. Zhu, J. Wu, C. Jia, L. Wang, G. Liu, N.-G. Park, H.-M. Cheng, Gradient Sn-Doped Heteroepitaxial Film of Faceted Rutile TiO2 as an Electron Selective Layer for Efficient Perovskite Solar Cells, ACS Appl. Mater. Interfaces 2019, 11, 19638-19646.

275. Y.J. Choi, L. Debbichi, D.-K. Lee, N.-G. Park, H. Kim, D. Kim, Light Emission Enhancement by Tuning the Structural Phase of APbBr3 (A = CH3NH3, Cs) Perovskites, J. Phys. Chem. Lett. 2019, 10, 2135-2142.

274. J.-W. Lee, S.-G. Kim, J.-M. Yang, Y. Yang, and N.-G. Park, Verification and mitigation of ion migration in perovskite solar cells, APL Mater. 2019, 7, 041111.

273. X. Zhao, J. Chen, N.-G. Park, Importance of Oxygen Partial Pressure in Annealing NiO Film for High Efficiency Inverted Perovskite Solar Cells, Sol. RRL 2019, 3, 1800339

272. D.-H. Kang, N.-G. Park, On the Current–Voltage Hysteresis in Perovskite Solar Cells: Dependence on Perovskite Composition and Methods to Remove Hysteresis, Adv. Mater. 2019, 31, 1805214.

271. S.-G. Kim, C. Li, A. Guerrero, J.-M. Yang, Y. Zhong, J. Bisquert, S. Huettner, and N.-G. Park, Potassium ions as a kinetic controller in ionic double layers for hysteresis-free perovskite solar cells, J. Mater. Chem. A 2019, 7, 32, 18807-18815.

270. E.-S. Choi, J.-M. Yang, S.-G. Kim, C. Cuhadar, S.-Y. Kim, S.H. Kim, D. Lee, N.-G. Park, The effect of compositional engineering of imidazolium lead iodide on the resistive switching properties, Nanoscale 2019, 11, 30, 14455-14464

269. S.-Y. Kim, J.-M. Yang, E.-S. Choi, N.-G. Park, Effect of interlayer spacing in layered perovskites on resistive switching memory, Nanoscale 2019, 11 (30), 14330-14338.

268. D.-N. Jeong, D.-K. Lee, S. Seo, S. Lim, Y. Zhang, H. Shin, H. Cheong, N.-G. Park, Perovskite Cluster-Containing Solution for Scalable D-Bar Coating toward High-Throughput Perovskite Solar Cells, ACS Energy Lett. 2019, 4 (5), 1189-1195.

267. J.-M. Yang, E.-S. Choi, S.-Y. Kim, J.-H. Kim, J.-H. Park, N.-G. Park, Perovskite-related (CH 3 NH 3) 3 Sb 2 Br 9 for forming-free memristor and low-energy-consuming neuromorphic computing, Nanoscale 2019, 11 (13), 6453-6461.

266. J. Chen, S.-G. Kim, X. Ren, H.S. Jung, N.-G. Park, Effect of bidentate and tridentate additives on the photovoltaic performance and stability of perovskite solar cells, J. Mater. Chem. A 2019, 7 (9), 4977-4987.

265. S. Seo, S. Jeong, H. Park, H. Shin, N.-G. Park, Atomic layer deposition for efficient and stable perovskite solar cells, Chem. Commun. 2019, 55 (17), 2403-2416.

264. H.-S. Kim, A. Hagfeldt, N.-G. Park, Morphological and compositional progress in halide perovskite solar cells, Chem. Commun. 2019, 55 (9), 1192-1200.

263. Y. Zhang, S.-G. Kim, D. Lee, H. Shin, N.-G. Park, Bifacial stamping for high efficiency perovskite solar cells, Energy & Environ. Sci. 2019, 12 (1), 308-321.

262. M. Lyu, J. Chen, N.-G. Park, Improvement of efficiency and stability of CuSCN-based inverted perovskite solar cells by post-treatment with potassium thiocyanate, J. Solid State Chem. 2019, 269, 367-374.
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261. J. Chen, N.-G. Park, Causes and solutions of recombination in perovskite solar cells, Adv. Mater. 2018, 31 (47), 1803019.

260. A.-N. Cho, I.-H. Jang, J.-Y. Seo, N.-G. Park, Dependence of hysteresis on the perovskite film thickness: inverse behavior between TiO2 and PCBM in a normal planar structure. J. Mater. Chem. A 2018, 6, 18206-18215.

259. K. Alberi, M. B. Nardelli, A. Zakutayev, L. Mitas, S. Curtarolo, A. Jain, M. Fornari, N. Marzari, I. Takeuchi, M. L Green, M.G Kanatzidis, M. F Toney, S. Butenko, B. Meredig, S. Lany, U. Kattner, A. Davydov, E. Toberer, V. Stevanovic, A. Walsh, N.-G. Park, A. A.-Guzik, D. Tabor, J. Nelson, J. Murphy, A. Setlur, J. Gregoire, H. Li, R. Xiao, A. Ludwig, L. W Martin, A. Rappe, S.-H. Wei, J. Perkins, The 2018 Materials by Design Roadmap. J. Phys. D: Appl. Phys. 2018, 52, 013001.

258. T. Sakaguchi, I. Jeon, T. Chiba, A. Shawky, R. Xiang, S. Chiashi, E. I. Kauppinen, N.-G. Park, Y. Matsuo, S. Maruyama, Non-doped and unsorted single-walled carbon nanotubes as carrier-selective, transparent, and conductive electrode for perovskite solar cells. MRS Commun. 2018, 8 (13), 1058-1063.

257. J. Chen, S.‐G. Kim, and N.‐G. Park, FA0.88Cs0.12PbI3−x(PF6)x Interlayer Formed by Ion Exchange Reaction between Perovskite and Hole Transporting Layer for Improving Photovoltaic Performance and Stability. Adv. Mater. 2018, 30 (40), 1801948.

256. J.‐M. Yang, S.‐G. Kim, J.‐Y. Seo, C. Cuhadar, D.‐Y. Son, D. Lee, N.‐G. Park, 1D Hexagonal HC(NH2)2PbI3 for Multilevel Resistive Switching Nonvolatile Memory. Adv. Electron. Mater. 2018, 4 (9), 1800190.

255. S.-G. Kim, J. Chen, J.-Y. Seo, D.-H. Kang, N.-G. Park, Rear surface passivation by melaminium iodide additive for stable and hysteresis-less perovskite solar cells. ACS Appl. Mater. Interfaces 2018, 10 (30), 28372-25383.

254. C. Cuhadar, S.-G. Kim, J.-M. Yang, J.-Y. Seo, D. Lee, N.-G. Park, All-Inorganic Bismuth Halide Perovskite-like Materials A3Bi2I9 and A3Bi1.8Na0.2I8.6 (A = Rb and Cs) for Low-Voltage Switching Resistive Memory, ACS Appl. Mater. Interfaces 2018, 10 (35), 29741-29749.

253. N.-G. Park, Halide perovskite photovoltaics: History, progress, and perspectives. MRS Bull. 2018, 43 (7), 527-553.

252. N.-G. Park, H. Segawa, Research Direction toward Theoretical Efficiency in Perovskite Solar Cells, ACS Photonics 2018, 5 (8), 2970-2977.

251. S. Seo, S. Jeong, C. Bae, N.-G. Park, and H. Shin, Perovskite Solar Cells with Inorganic Electron- and Hole- Transport Layers Exhibiting Long-Term (≈500 h) Stability at 85 °C under Continuous 1 Sun Illumination in Ambient Air, Adv. Mater. 2018, 30, 1801010.

250. S. Benhattaba, A.-N. Cho, R. Nakara, N. Bertona, F. T.-Vana, N.-G. Park, B. Schmaltza, Simply designed carbazole-based hole transporting materials for efficient perovskite solar cells, Org. Electron. 2018, 56, 27-30.

249. R. Nakar, A. N. Cho, N. Berton, J. F. Vincent, F. T. Van, N.-G. Park, B. Schmaltz, Triphenylamine 3,6 carbazole derivative as hole transporting material for mixed cation perovskite solar cells, Chemical Papers 2018, 72 (7), 1779-1787.

248. Y. Zhang, S.-G. Kim, D.-K. Lee, N.-G. Park, CH3NH3PbI3 and HC(NH2)2PbI3 Powders Synthesized from Low-Grade PbI2: Single Precursor for High-Efficiency Perovskite Solar Cells, ChemSusChem 2018, 11, 1813-1823.

247. P. Zhao, M. Han, W. Yin, X. Zhao, S.-G. Kim, Y. Yan, M. Kim, Y. J. Song, N.-G. Park, H. S. Jung, Insulated interlayer for efficient and photostable electron-transport-layer-free perovskite solar cells, ACS Appl. Mater. Interfaces 2018, 10 (12), 10132–10140.

246. J. Chen, N.-G. Park, Inorganic Hole Transporting Materials for Stable and High Efficiency Perovskite Solar Cells, J. Phys. Chem. C 2018, 122 (25), 14039-14063.

245. H.-S. Yoo, N.-G. Park, Post-treatment of perovskite film with phenylalkylammonium iodide for hysteresis-less perovskite solar cells, Sol. Energy Mater. Sol. Cells 2018, 179,57-65.

244. S. I. Seok, M. Grätzel, N.-G. Park, Methodologies toward Highly Efficient Perovskite Solar Cells, Small 2018, 14 (20),1704177.

243. L. Xie, A.-N. Cho, N.-G. Park, and K. Kim, An Efficient and Reproducible CH3NH3PbI3 Perovskite Layer Prepared Using a Binary Solvent Containing a Cyclic Urea Additive, ACS. Appl. Mater. interfaces 2018, 10 (11), 9390-9397.

242. J. Chen, J.-Y. Seo, N.-G. Park, Simultaneous Improvement of Photovoltaic Performance and Stability by in-situ formation of 2-Dimensioanl Perovskite at (FAPbI3)0.88,(CsPbBr3)0.12/CuSCN Interface, Adv. Energy Mater. 2018, 8 (12), 1702714.

241. D.-Y. Son, S.-G. Kim, J.-Y. Seo, S.-H. Lee, D. Lee, N.-G. Park, Universal Approach toward Hysteresis−Free Perovskite Solar Cell via Defect Engineering, J. Am. Chem. Soc. 2018, 140 (4),1358–1364.
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240. H. S. Jung, D. G. Lee, H. Shin, P.J. Yoo, J. H. Park, D.-Y. Jung, N.-G. Park, Enthusiastic Discussions on Halide Perovskite Materials beyond Photovoltaics at Sungkyun International Solar Forum 2017 (SISF2017), ACS Energy Lett. 2017, 3, 199-203.

239. K.-H. Jung, J.-Y. Seo, S. Lee, H. Shin, N.-G. Park, Solution-processed SnO2 thin film for a hysteresis-free planar perovskite solar cell with a power conversion efficiency of 19.2%, J. Mater. Chem. A 2017, 5, 24790-24803.

238. Y. C. Kim, K. H. Kim, D.-Y. Son, D.-N. Jeong, J.-Y. Seo, Y. S. Choi, I. T. Han, S. Y. Lee, N.-G. Park, Printable organometallic perovskite enables large-area, low-dose X-ray imaging, Nature 2017, 550, 87-91.

237. J. Chen, D. Lee, N.-G. Park, Stabilizing Ag Electrode and Reducing J-V Hysteresis via Suppression of Iodide Migration in Perovskite Solar Cell, ACS Appl. Mater. Interfaces 2017, 9 (41), 36338-36349.

236. Z. Hawash, S. R. Raga, D.-Y. Son, N.-G. Park, Y. Qi, Interfacial Modification of Perovskite Solar Cells Using an Ultrathin MAI Layer Leads to Enhanced Energy Level Alignment, Efficiencies, and Reproducibility, Nanoscale 2017, 9, 15278-15285.

235. J.-Y. Seo, J. Choi, H.-S. Kim, J. Kim, J.-M. Yang, C. Cuhadar, J. S. Han, S.-J. Kim, D. Lee, H. W. Jang, N.-G. Park, Wafer-Scale Reliable Switching Memory based on 2-Dimensional Layered Organic-Inorganic Halide Perovskite, Nanoscale 2017, 9, 15278-15285.

234. A.-N. Cho, N.-G. Park, Impact of Interfacial Layers in Perovskite Solar Cells, ChemSusChem 2017, 10, 3687-3704.

233. L. K. Ono, N.-G. Park, K. Zhu, W. Huang, and Y. Qi, Perovskite Solar Cells-Towards Commercialization, ACS Energy Lett. 2017, 2, 1749-1751.

232. J.-W. Lee, S.-G. Kim, S.-H. Bae, D.-K. Lee, O. Lin, Y. Yang, N.-G. Park, The Interplay between Trap Density and Hysteresis in Planar Heterojunction Perovskite Solar Cells, Nano Lett. 2017, 17 (7), 4270-4276.

231. J. Ciro, S. Mesa, J. I. Uribe, M. A. M.-Escobar, D. Ramirez, J. F. Montoya, R. Betancur, H.-S. Yoo, N.-G. Park, F. Jaramillo, Optimization of the Ag/PCBM interface by Rhodamine interlayer to enhance efficiency and stability of perovskite solar cells, Nanoscale 2017, 9, 9440-9446.

230. K. Kranthiraja, K. Gunasekar, H. Kim, A.-N. Cho, N.-G. Park, S. Kim, B. J. Kim, R. Nishikubo, A. Saeki, M. Song, S.-H. Jin, High-Performance Long-Term-Stable Dopant-Free Perovskite Solar Cells and Additive-Free Organic Solar Cells by Employing Newly Designed Multirole π-Conjugated Polymers, Adv. Mater. 2017, 29, 1700183.

229. A.-N. Cho, N. Chakravarthi, K. Kranthiraja, S. S. Reddy, H.-S. Kim, S.-H. Jin, N.-G. Park, Acridine-based novel hole transporting material for high efficiency perovskite solar cells, J. Mater. Chem. A 2017, 5, 7603-7611.

228. J.-W. Lee, Y. J. Choi, J.-M. Yang, S. Ham, S. K. Jeon, J. Y. Lee, Y.-H. Song, E. K. Ji, D.-H. Yoon, S. Seo, H. Shin, G. S. Han, H. S. Jung, D. Kim, N.-G. Park, In-Situ Formed Type I Nanocrystalline Perovskite Film for Highly Efficient Light-Emitting Diode, ACS Nano 2017, 11, 3311-3319.

227. X. Zhao, H.-S. Kim, J.-Y. Seo, N.-G. Park, Effect of Selective Contacts on the Thermal Stability of Perovskite Solar Cells, ACS Appl. Mater. Interfaces 2017, 9, 7148-7153.

226. D. Wei, J. Ji, D. Song, M. Li, P. Cui, Y.Li, J. M. Mbengue, W. Zhou, Z. Ning, N.-G. Park, A TiO2 embedded structure for perovskite solar cells with anomalous grain growth and effective electron extraction, J. Mater. Chem. A 2017, 5, 1406-1414.

225. S. Ham, Y. J. Choi, J.-W. Lee, N.-G. Park, D. Kim, Impact of Excess CH3NH3I on Free Carrier Dynamics in High-Performance Non-Stoichiometric Perovskites, J. Phys. Chem. C 2017, 121, 3143-3148.
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224. H.-S. Kim, J.-Y. Seo, N.-G. Park, Impact of Selective Contacts on Long-Term Stability of CH3NH3PbI3 Perovskite Solar Cells, J. Phys. Chem. C 2016, 120, 27840-27848.

223. N.-G. Park, Nonstoichiometric Adduct Approach for High-Efficiency Perovskite Solar Cells, Inorg. Chem. 2016, 56, 3-10.

222. N.-G. Park, M. Grätzel, T. Miyasaka, K. Zhu, K. Emery, Towards stable and commercially available perovskite solar cells. Nat. Energy 2016, 16152.

221. N.-G. Park, Across the Board: Nam-Gyu Park, ChemSusChem 2016, 9, 2525-2527.

220. J.-W. Lee, H.-S. Kim, H. Shin, H. S. Jung, P. J. Yoo, J. H. Park, D.-Y. Jung, N.-G. Park, A Sharp Focus on Perovskite Solar Cells at Sungkyun International Solar Forum (SISF), ACS Energy Lett. 2016, 1, 500-502.

219. M.-C. Kim, B. J. Kim, D.-Y. Son, N.-G. Park, H.-S. Jung, M. Choi, Observation of Enhanced Hole Extraction in Br Concentration Gradient Perovskite Materials, Nano Lett. 2016, 16, 5756-5763.

218. H.-S. Kim, J.-Y. Seo, N.-G. Park, Material and Device Stability in Perovskite Solar Cells, ChemSusChem 2016, 9, 2528-2540.

217. Q. Chen, H. Liu, H.-S. Kim, Y. Liu, M. Yang, N. Yue, G. Ren, K. Zhu, S. Liu, N.-G. Park, Y. Zhang, Multiple-stage structure transformation of organic-inorganic hybrid perovskite CH3NH3PbI3, Phys. Rev. X 2016, 6, 031042.

216. N.-G. Park, Methodologies for high efficiency perovskite solar cells, Nano Converg. 2016, 3:15.

215. A.-N. Cho, H.-S. Kim, T.-T. BUI, F. Goubard, X. Sallenave, N.-G. Park, Role of LiTFSI in High Tg Triphenylamine-based Hole Transporting Material in Perovskite Solar Cell, RSC Adv. 2016, 6, 68553-68559.

214. H. Kim, H.-S. Kim, J. Ha, N.-G. Park, S. Yoo, Empowering Semi-Transparent Solar Cells with Thermal-Mirror Functionality, Adv. Energy Mater. 2016, 6 (14), 1502466.

213. J. Choi, S. Park, J. Lee, K. Hong, D.-H. Kim, H. S. Jung, N.-G. Park, S. Han, K. T. Nam, H. W. Jang, Organolead Halide Perovskites for Low Operating Voltage Multilevel Resistive Switching, Adv. Mater. 2016, 28, 6562-6567.

212. D.-Y. Son, J.-W. Lee, Y. J. Choi, I.-H. Jang, S. Lee, P. J. Yoo, H. Shin, N. Ahn, M. Choi, D. Kim, N.-G. Park, Self-formed grain boundary healing layer for highly efficient CH3NH3PbI3 perovskite solar cells, Nat. Energy 2016, 1, 10681.

211. S. Seo, I. J. Park, M. Kim, S. Lee, C. Bae, H. S. Jung, N.-G. Park, J. Y. Kim, H. Shin, An ultra-thin, un-doped NiO hole transporting layer of highly efficient (16.4%) organic–inorganic hybrid perovskite solar cells, Nanoscale 2016, 8, 11403-11412.

210. N.-G. Park, Crystal Growth Engineering for High Efficiency Perovskite Solar Cells, Cryst. Eng. Comm. 2016, 18, 5977-5985.

209. D. Song, D. Wei, P. Cui, M. Li, Z. Duan, T. Wang, J. Ji, Y. Li, J. M. Mbenque, Y. Li, Y. He, M. Trevor, N.-G. Park, Dual function interfacial layer for highly efficient and stable lead halide perovskite solar cells, J. Mater. Chem. A 2016, 4, 6091-6097.

208. S. M. Kang, S. Jang, J.-K. Lee, J. Yoon, D.-E. Yoo, J.-W. Lee, M. Choi, N.-G. Park, Moth-Eye TiO2 Layer for Improving Light Harvesting Efficiency in Perovskite Solar Cells, Small 2016, 12, 2443-2449.

207. J.-M. Cha, J.-W. Lee, D.-Y. Son, H.-S. Kim, I.-H. Jang, N.-G. Park, Mesoscopic perovskite solar cells with an admixture of nanocrystalline TiO2 and Al2O3: role of interconnectivity of TiO2 in charge collection, Nanoscale 2016, 8, 6341-6351.

206. J.-W. Lee, H.-S. Kim, N.-G. Park, Lewis Acid–Base Adduct Approach for High Efficiency Perovskite Solar Cells, Acc. Chem. Res. 2016, 49, 311–319.

205. H. Sung, N. Ahn, M. S. Jang, J.-K. Lee, H. Yoon, N.-G. Park, M. Choi, Transparent Conductive Oxide-Free Graphene-Based Perovskite Solar Cells with over 17% Efficiency, Adv. Energy Mater. 2016, 6, 1501873.

204. A. Kim, H. Lee, H.-C. Kwon, H. S. Jung, N.-G. Park, S. Jeong, J. Moon, Fully solution-processed transparent electrodes based on silver nanowire composites for perovskite solar cells, Nanoscale 2016, 8, 6308-6316.
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203. I. J. Park, M. A. Park, D. H. Kim, G. D. Park, B. J. Kim, H. J. Son, M. J. Ko, D.-K. Lee, T. Park, H. Shin, N.-G. Park, H. S. Jung, J. Y. Kim, New Hybrid Hole Extraction Layer of Perovskite Solar Cells with a Planar p−i−n Geometry, J. Phys. Chem. C 2015, 119, 27285−27290.

202. G. S. Han, Y. H. Song, Y. U. Jin, J.-W. Lee, N.-G. Park, B. K. Kang, J.-K. Lee, I. S. Cho, D. H. Yoon, H. S. Jung, Reduced Graphene Oxide/Mesoporous TiO2 Nanocomposite Based Perovskite Solar Cells, ACS Appl. Mater. Interfaces 2015, 7, 23521−23526.

201. X. Zhao, N.-G. Park, Stability Issues on Perovskite Solar Cells, Photonics 2015, 2, 1139-1151.

200. R. Ohmann, L. K. Ono, H.-S. Kim, H. Lin, M. V. Lee, Y. Li, N.-G. Park, Y. Qi, Real-space imaging of the atomic structure of organic-inorganic perovskite, J. Am. Chem. Soc. 2015, 137, 16049-16054.

199. M.-C. Kim, B. J. Kim, J. Yoon, J.-W. Lee, D. Suh, N.-G. Park , M. Choi, H. S. Jung, Electro-spray Deposition of Mesoporous TiO2 Charge Collection Layer: Toward Large Scale and Continuous Production of Highly Efficiency Perovskite Solar Cell, Nanoscale 2015, 7, 20725-20733.

198. H.-S. Kim, I.-H. Jang, N. Ahn, M. Choi, A. Guerrero, J. Bisquert, N.-G. Park, Control of I–V Hysteresis in CH3NH3PbI3 Perovskite Solar Cell, J. Phys. Chem. Lett. 2015, 6, 4633-4639.

197. S. Mastroianni , F. D. Heinz , J.-H. Im , W. Veurman , M. Padilla , M. C. Schubert , U. Würfel , M. Grätzel , N.-G. Park, A. Hinsch, Analysing the effect of crystal size and structure in highly efficient CH3NH3PbI3 perovskite solar cells by spatially resolved photo- and electroluminescence imaging, Nanoscale 2015, 7, 19653-19662.

196. J.-W. Lee, D.-H. Kim, H.-S. Kim, S.-W. Seo, S. M. Cho, N.-G. Park, Formamidinium and Cesium Hybridization for Photo- and Moisture-Stable Perovskite Solar Cell, Adv. Energy Mater. 2015, 5, 1501310.

195. A R. Park, D.-Y. Son, J. S. Kim, J. Y. Lee, N.-G. Park, J. Park, J. K. Lee, P. J. Yoo, Si/Ti2O3/Reduced Graphene Oxide Nanocomposite Anodes for Lithium-Ion Batteries with Highly Enhanced Cyclic Stability, ACS Appl. Mater. Interfaces 2015, 7, 18483−1849.

194. G. S. Han, H. S. Chung, D. H. Kim, B. J. Kim, J.-W. Lee, N.-G. Park, I. S. Cho, J.-K. Lee, S. Lee, and H. S. Jung, Epitaxial 1D Electron Transport Layers for HighPerformance Perovskite Solar Cells, Nanoscale 2015, 7, 15284-15290.

193. N. Ahn, S. M. Kang, J.-W. Lee, M. Choi, N.-G. Park, Thermodynamic Regulation of CH3NH3PbI3 Crystal Growth and Its Effect on Photovoltaic Performance of Perovskite Solar Cell, J. Mater. Chem. A 2015, 3, 19901-19906.

192. N.-G. Park, Emergence and Evolution of Organometal Halide Perovskite Solar Cell, Rapid Commun. Photosci 2015, 4, 29-30.

191. J.-W. Lee, N.-G. Park, Two-step deposition method for high-efficiency perovskite solar cells, MRS Bull. 2015, 40, 654-659.

190. Y. Kim, T. I. Ryu, K.-H. Ok, M.-G. Kwak, S. Park, N.-G. Park, C. J. Han, B. S. Kim, M. J. Ko, H. J. Son, J.-W. Kim, Inverted Layer-By-Layer Fabrication of an Ultraflexible and Transparent Ag Nanowire/Conductive Polymer Composite Electrode for Use in High-Performance Organic Solar Cells, Adv. Funct. Mater. 2015, 25, 4580–4589.

189. N.-G. Park, Sustainable Chemistry at Sungkyunkwan University, ChemSusChem 2015, 8, 2271.

188. N. Ahn , D.-Y. Son , I.-H. Jang , S. M. Kang , M. Choi , N.-G. Park, Highly Reproducible Perovskite Solar Cells with Average Efficiency of 18.3% and Best Efficiency of 19.7% Fabricated via Lewis Base Adduct of Lead(II) Iodide, J. Am. Chem. Soc. 2015, 137 (27), 8696–8699.

187. S.-B. Ko, T. I. Ryu, A.-N. Cho, J. Fujisawa, H. Segawa, N.-G. Park, Visible light absorption and photoelectrochemical activity of colorless molecular 1,3-bis(dicyanomethylidene)indane (BDMI) by surface complexation on TiO2, Phys. Chem. Chem. Phys. 2015, 17, 18541-18546.

186. B. J. Kim, D. H. Kim, Y.-Y. Lee, H.-W. Shin, G. S. Han, J. S. Hong, K. Mahmood, T. K. Ahn, Y.-C. Joo, K. S. Hong, N.-G. Park, S. Lee, H. S. Jung, Highly efficient and bending durable perovskite solar cells: toward a wearable power source, Energy Environ. Sci. 2015, 8, 916-921.

185. H.-W. Kang, J.-W. Lee, D.-Y. Son, N.-G. Park, Modulation of Photovoltage in Mesoscopic Perovskite Solar Cell by Controlled Interfacial Electron Injection, RSC Adv. 2015, 5, 47334 – 47340.

184. Z. Lin, N.-G. Park, G. Li, Themed issue on perovskite solar cells, J. Mater. Chem. A 2015, 3, 8924-8925.

183. D.-Y. Son, C.-R. Lee, H.-W. Shin, I.-H. Jang, H. S. Jung, T. K. Ahn, N.-G. Park, Understanding the role of the dye/oxide interface via SnO2-based MK-2 dye-sensitized solar cells, PhyChemChemPhy 2015, 17, 15193-15200.

182. D.-Y. Son , K.-H. Bae , H.-S. Kim, and N.-G. Park, Effects of Seed Layer on Growth of ZnO Nanorod and Performance of Perovskite Solar Cell, J. Phys. Chem. C 2015, 119 (19), 10321–10328.

181. H.-S. Kim, S. K. Kim, B. J. Kim, K.-S. Shin, M. K. Gupta, H. S. Jung, S.-W. Kim, N.-G. Park, Ferroelectric Polarization in CH3NH3PbI3 Perovskite, J. Phys. Chem. Lett. 2015, 6, 1729–173.

180. D. H. Kim, G. S. Han, W. M. Seong, J.-W. Lee, B. J. Kim, N.-G. Park, K. S. Hong, S. Lee, H. S. Jung, Niobium Doping Effects on TiO2 Mesoscopic ElectronTransport Layer-Based Perovskite Solar Cells, ChemSusChem 2015, 8, 2392-2398.

179. D.-J. Seol, J.-W. Lee, N.-G. Park, On the Role of Interfaces in Planar-Structured HC(NH2)2PbI3 Perovskite Solar Cells, ChemSusChem 2015, 8, 2414-2419.

178. H.-S. Ko, J.-W. Lee, N.-G. Park, 15.76% Efficiency Perovskite Solar Cell Prepared under High Relative Humidity: Importance of PbI2 Morphology in Two-Step Deposition of CH3NH3PbI3, J. Mater. Chem. A 2015, 3, 8808-8815.

177. J.-H. Im, J. Luo, M. Franckevicius, N. Pellet, P. Gao, T. Moehl, S. M. Zakeeruddin, M. K. Nazeeruddin, M. Gratzel, N.-G. Park, Nanowire Perovskite Solar Cell, Nano Lett. 2015, 15, 2120-2126.

176. L. Bertoluzzi, R. S. Sanchez, L. Liu, J.-W. Lee, E. M.-Marza, H. Han, N.-G. Park, I. M.-Sero, J. Bisquert, Cooperative kinetics of depolarization in CH3NH3PbI3 perovskite solar cells, Energy Environ. Sci. 2015, 8, 910-915.

175. H. Uzu, M. Ichikawa, M. Hino, K. Nakano, T. Meguro, J. L. H. andez, H.-S. Kim, N.-G. Park, K. Yamamoto, High efficiency solar cells combining a perovskite and a silicon heterojunction solar cells via an optical splitting system, Appl. Phys. Lett. 2015, 106, 013506.

174. H. S. Jung, N.-G. Park, Perovskite Solar Cells: From Materials to Devices, Small 2015, 11, 10-25.

173. N.-G. Park, Perovskite solar cells : Switchable photovoltaics, Nature Mater. 2015, 14, 140-141.

172. J.-W. Lee, S. H. Lee, H.-S. Ko, J. Kwon, J. H. Park, S. M. Kang, N. Ahn, M. Choi, J. K. Kim, N.-G. Park, Opto-electronic Property of TiO2 Nanohelices-embedded HC(NH2)2PbI3 Perovskite Solar Cells, J. Mater. Chem. A 2015, 3, 9179-9186.

171. G. S. Han, H. S. Chung, B. J. Kim, d. H. Kim, J.-W. Lee, B. S. Swain, K. Mahmood, J. S. Yu, N.-G. Park, J. H. Lee, H. S. Jung, Retarding Charge Recombination in Perovskite Solar Cells Using Ultrathin MgO-coated TiO2 Nanoparticulate Films, J. Mater. Chem. A 2015, 3, 9160-9164.

170. H.-W. Kang, J.-W. Lee, N.-G. Park, Effect of Double Blocking Layers at TiO2/Sb2S3 and Sb2S3/spiro-MeOTAD Interfaces on Photovoltaic Performance, Faraday Discuss 2015, 176, 287-299.

169. N.-G. Park, Perovskite solar cells: an emerging photovoltaic technology, Mater. Today 2015, 15, 65-72.
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168. M. S. A. S. Shah, W.-J. Kim, J. Park, D. K. Rhee, I.-H. Jang, N.-G. Park, J. Y. Lee, P. J. Yoo, Highly Efficient and Recyclable Nanocomplexed Photocatalysts of AgBr/N-Doped and Amine-Functionalized Reduced Graphene Oxide, ACS Appl. Mater. Interfaces 2014, 6 (23), pp 20819–20827.

167. T. I. Ryu, Y. Yoon, J.-H. Kim, D.-H. Hwang, M. J. Ko, D.-K. Lee, J. Y. Kim, H. Kim, N.-G. Park, B. S. Kim, H. J. Son, Simultaneous Enhancement of Solar Cell Efficiency and Photostability via Chemical Tuning of Electron Donating Units in Diketopyrrolopyrrole-Based Push-Pull Type Polymers, Macromolecules 2014, 47, 6270-6280.

166. T. Moehl, J.-H. Im, Y. H. Lee, K. Domanski, F. Giordano, S. M. Zakeeruddin , M. I. Dar, L.-P. Heiniger, M. K. Nazeeruddin, N.-G. Park, M. Gratzel, Strong Photocurrent Amplification in Perovskite Solar Cells with a Porous TiO2 Blocking Layer under Reverse Bias, J. Phys. Chem. Lett. 2014, 5, 3931-3936.

165. S. M. Kang, N. Ahn, J.-W. Lee, M. Choi, N.-G. Park, Water-Repellent Perovskite Solar Cell, J. Mater. Chem. A 2014, 2, 20017-20021.

164. L. S. Oh, D. H. Kim, J. A. Lee, S. S. Shin, J.-W. Lee, I. J. Park, M. J. Ko, N.-G. Park, S. G. Pyo, K. S. Hong, J. Y. Kim, Zn2SnO4-Based Photoelectrodes for Organolead Halide Perovskite Solar Cells, J. Phys. Chem. C 2014, 118, 22991-22994.

163. J.-H. Yum, J.-W. Lee, Y. Kim, R. H.-Baker, N.-G. Park, M. Gratzel, Panchromatic light harvesting by dye- and quantum dot-sensitized solar cells, Sol. Energy 2014, 109, 183-188.

162. J. Luo, J.-H. Im, M. T. Mayer, M. Schreier, M. K. Nazeeruddin, N.-G. Park, S. D. Tilley, H. J. Fan, M. Gratzel, Water photolysis at 12.3% efficiency via perovskite photovoltaics and Earth-abundant catalysts, Science 2014, 26, 1593-1596.

161. J.-H. Im, I.-H. Jang, N. Pellet, M. Gratzel, N.-G. Park, Growth of CH3NH3PbI3 cuboids with controlled size for high-efficiency perovskite solar cells, Nat. Nanotechnol 2014, 9, 927-932.

160. H.-S. Kim, N.-G. Park, Parameters Affecting I-V Hysteresis of CH3NH3PbI3 Perovskite Solar Cells: Effects of Perovskite Crystal Size and Mesoporous TiO2 Layer, J. Phys. Chem. Lett. 2014, 5, 2927-2934.

159. J.-H. Im, H.-S. Kim, N.-G. Park, Morphology-photovoltaic property correlation in perovskite solar cells: One-step versus two-step deposition of CH3NH3PbI3, APL Mater. 2014, 2, 081510.

158. G. S. Han, S. Lee, J. H. Noh, H. S. Chung, J. H. Park, B. S. Swain, J.-H. Im, N.-G. Park, H. S. Jung, 3-D TiO2 nanoparticle/ITO nanowire nanocomposite antenna for efficient charge collection in solid state dye-sensitized solar cells, Nanoscale 2014, 6, 6127-6132.

157. M. Gratzel, N.-G. Park, Organometal Halide Perovskite Photovoltaics: a Diamond in the Rough, NANO 2014, 09, 1440002.

156. R. S. Sanchez, V. G.-Pedro, J.-W. Lee, N.-G. Park, Y. S. Kang, I. M.-Sero, J. Bisquert, Slow Dynamic Processes in Lead Halide Perovskite Solar Cells. Characteristic Times and Hysteresis, J. Phys. Chem. Lett. 2014, 5, 2357-2363.

155. J.-W. Lee, D.-J. Seol, A.-N. Cho, N.-G. Park, High-Efficiency Perovskite Solar Cells Based on the Black Polymorph of HC(NH2)2PbI3, Adv. Mater. 2014, 26, 4991-4998.

154. J.-W. Lee, S. Park, M. J. Ko, H. J. Son, N.-G. Park, Enhancement of the Photovoltaic Performance of CH3NH3PbI3 Perovskite Solar Cells through a Dichlorobenzene-Functionalized Hole-Transporting Material, ChemPhysChem 2014, 15, 2595-2603.

153. J.-W. Lee, T.-Y. Lee, P. J. Yoo, M. Gratzel, S. Mhaisalkar, N.-G. Park, Rutile TiO2-based perovskite solar cells, J. Mater. Chem. A 2014, 2, 9251-9259.

152. D.-Y. Son, J.-H. Im, H.-S. Kim, N.-G. Park, 11% Efficient Perovskite Solar Cell Based on ZnO Nanorods: An Effective Charge Collection System, J. Phys. Chem. C 2014, 118, 16567-16573.

151. T.-Y. Lee, H.-S. Kim, N.-G. Park, Evaluation of Limiting Factors Affecting Photovoltaic Performance of Low-Temperature-Processed TiO2 Films in Dye-Sensitized Solar Cells, ChemPhysChem 2014, 15, 1098-1105.

150. H.-S. Kim, S. H. Kim, N.-G. Park, Organolead Halide Perovskite: New Horizons in Solar Cell Research, J. Phys. Chem. C 2014, 118(11), 5615-5625.

149. S. Dharani, H. K. Mulmudi, N. Yantara, P. T. T. Trang, N.-G. Park, M. Graetzel, S. Mhaisalkar, N. Mathews, and P. P. Boix, High efficiency electrospun TiO2 nanofiber based hybrid organic-inorganic perovskite solar cell, Nanoscale 2014, 6, 1675-1679.
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148. H.-S. Kim, I. M.-Sero, V. G.-Pedro, F. F.-Santiago, E. J. J.-Perez, and N.-G. Park, J. Bisquert, Mechanism of carrier accumulation in perovskite thin-absorber solar cells, Nature Commun. 2013, 4, 2242.

147. N.-G. Park, Organometal perovskite light absorbers toward a 20% efficiency low-cost solid-state mesoscopic solar cell, J. Phys. Chem. Lett. 2013, 4, 2423-2429.

146. J.-W. Lee, J.-D. Hong, and N.-G. Park, Sixfold enhancement of photocurrent by surface charge controlled high density quantum dot coating, Chem.Commun. 2013, 49, 6448-6450.

145. H.-S. Kim, J.-W. Lee, N. Yantara, P. P. Boix, S. A. Kulkarni, S. Mhaisalkar, M. Gratzel, and N.-G. Park, High efficiency solid-state sensitized solar cell-based on submicrometer rutile TiO2 nanorod and CH3NH3PbI3 perovskite sensitizer, Nano Lett. 2013, 13, 2412-2417.

144. M. S. A. S. Shah, K. Zhang, A. Reum Park, K. S. Kim, N.-G. Park, J. H. Park, and P. J. Yoo, Single-step solvothermal synthesis of mesoporous Ag-TiO2-reduced graphene oxide ternary composites with enhanced photocatalytic activity, Nanoscale 2013, 5, 5093-5101.

143.N. K. Huu, D.-Y. Son, I.-H. Jang, C.-R. Lee, and N.-G. Park, Hierarchical SnO2 nanoparticle-ZnO nanorod photoanode for improving transport and lifetime of photoinjected electrons in dye-sensitized solar cell, ACS Appl. Mater. Interfaces 2013, 5, 1038-1043.

142.J.-W. Lee, D.-Y. Son, T. K. Ahn, H.-W. Shin, I. Y. Kim, S.-J. Hwang, M. J. Ko, S. Sul, H. Han, and N.-G. Park, Quantum-dot-sensitized solar cell with unprecedentedly high photocurrent, Sci. Rep. 2013, 3, 1050.

141. J.-W. Lee, J.-H. Im, and N.-G. Park, Quantum confinement of CdSe induced by nanoscale solvothermal reaction, Nanoscale 2012, 4, 6642-6648.

140. Y. Li, D.-K. Lee, J. Y. Kim, B. Kim, N.-G. Park, K. Kim, J.-H. Shin, I.-S. Choi, and M. J. Ko, Highly durable and flexible dye-sensitized solar cells fabricated on plastic substrates: PVDF-nanofiber-reinforced TiO2 photoelectrodes, Energy Environ. Sci. 2012, 5, 8950-8957.

139. K. S. Lee, J. Kwon, J. H. Im, C. R. Lee, N.-G. Park, and J. H. Park, Size-tunable, fast, and facile synthesis of titanium oxide nanotube powders for dye-sensitized solar cells, ACS Appl. Mater. Interfaces 2012, 4(8), 4164-4168.

138. J.-H. Im, J. Chung, S.-J. Kim, and N.-G. Park, Synthesis, structure, and photovoltaic property of a nanocrystalline 2H perovskite-type novel sensitizer (CH3CH2NH3)PbI3, Nanoscale Res. Lett. 2012, 7, 353.

137. S. Y. Bang, M. J. Ko, K. Kim, J. H. Kim, I.-H. Jang, and N.-G. Park, Evaluation of dye aggregation and effect of deoxycholic acid concentration on photovoltaic performance of N719-sensitized solar cell, Synth. Met. 2012, 162, 1503-1507.

136. H.-S. Kim, C.-R. Lee, J.-H. Im, K.-B. Lee, T. Moehl, A. Marchioro, S.-J. Moon, R. Humphry- Baker, J.-H. Yum, J. E. Moser, M. Gratzel, and N.-G. Park, Lead iodide perovskite sensitized all-solid-state submicron thin film mesoscopic solar cell with efficiency exceeding 9%, Sci. Rep. 2012, 2, 591.

135. J.-S. Lee, I.-H. Jang, and N.-G. Park, Effect of oxidation state and crystallinity of tungsten oxide interlayer on photovoltaic property in bulk hetero-junction solar cell, J. Phys. Chem. C 2012, 116(25), 13480-13487.

134. M.-J. Kim, and N.-G. Park, Urea as a long-term stable alternative to guanidium thiocyanate additive in dye-sensitized solar cell, Appl. Surf. Sci. 2012, 258(22), 8915-8918.

133. M.-J. Kim, Y.-J. Yu, J.-H. Kim, Y.-S. Jung, K.-Y. Kay, S.-B. Ko, C.-R. Lee, I.-H. Jang, Y.-U. Kwon, and N.-G. Park, Tuning of spacer groups in organic dyes for efficient inhibition charge recombination in dye-sensitized solar cells, Dyes Pigm. 2012, 95(1), 134-141.

132. H.-S. Kim, C.-R. Lee, I.-k Jang, W. Kang, and N.-G. Park, Effect of overlayer thickness of hole transport material on photovoltaic performance in solid-sate dye-sensitized solar cell, Bull. Korean Chem. Soc. 2012, 33(2), 670-674.

131. S.-B. Ko, A.-N. Cho, M.-J. Kim, C.-R. Lee, and N.-G. Park, Alkyloxy substituted organic dyes for high voltage dye-sensitized solar cell: Effect of alkyloxy chain length on open-circuit voltage, Dyes Pigm. 2012, 94(1), 88-98.

130. H.-S. Kim, S.-B. Ko, I.-H. Jang, and N.-G. Park, Improvement of mass transport of the [Co(bpy)3]II/III redox couple by controlling nanostructure of TiO2 films in dye-sensitized solar cells, Chem. Commun. 2011, 47, 12637-12639.

129. S.-R. Jang, K. Zhu, M. J. Ko, K. Kim, C. Kim, N.-G. Park, and A. J. Frank, Voltage-enhancement mechanisms of an organic dye in high open-circuit voltage solid-state dye-sensitized solar cells, ACS Nano 2011, 5(10), 8267-8274.

128. J.-H. Im, C.-R. Lee, J.-W. Lee, S.-W. Park, and N.-G. Park, 6.5% efficient perovskite quantum dot-sensitized solar cell, Nanoscale 2011, 3, 4088.

127. W.-S. Jeong, J.-W. Lee, S. Jung, J. H. Yun, and N.-G. Park, Evaluation of external quantum efficiency of a 12.35% tandem solar cell comprising dye-sensitized and CIGS solar cells, Sol. Energy Mater. Sol. Cells 2011, 95, 3419.

126. A. Anthonysamy, Y. Lee, B. Karunagaran, V. Ganapathy, S.-W. Rhee, S. Karthikeyan, K. S. Kim, M. J. Ko, N.-G. Park, M.-J. Ju, and J. K. Kim, Molecular design and synthesis of ruthenium(ii) sensitizers for highly efficient dye-sensitized solar cells, J. Mater. Chem. 2011, 21, 12389.

125. C.-R. Lee, H.-S. Kim, I.-H. Jang, J.-H. Im, and N.-G. Park, Pseudo first-order adsorption kinetics of N719 dye on TiO2 surface, ACS Appl. Mater. Interfaces 2011, 3, 1953-1957.

124. A. Mao, N.-G. Park, G. Y. Han, and J. H. Park, Controlled growth of vertically oriented hematite/Pt composite nanorod arrays: use for photoelectrochemical water splitting, Nanotechnology 2011, 22, 175703.

123. K. S. Lee, W. J. Lee, N.-G. Park, S. O. Kim, and J. H. Park, Transferred vertically aligned n-doped carbon nanotube arrays: use in dye-sensitized solar cells as counter electrodes, Chem. Commun. 2011, 47, 4264-4266.

122. Y. Li, W. Lee, D.-K. Lee, K. Kim, N.-G. Park, and M. J. Ko, Pure anatase TiO2 “nanoglue”: an inorganic binding agent to improve nanoparticle interconnections in the low-temperature sintering of dye-sensitized solar cells, Appl. Phys. Lett. 2011, 98, 103301.

121. B. Yoo, K.-J. Kim, Y. H. Kim, K. Kim, M. J. Ko, W. M. Kim, and N.-G. Park, Titanium nitride thin film as a novel charge collector in TCO-less dye-sensitized solar cell, J. Mater. Chem. 2011, 21, 3077-3084.

120. C.-R. Lee, H.-S. Kim, and N.-G. Park, Dependence of porosity, charge recombination kinetics and photovoltaic performance on annealing condition of TiO2 films, Front. Optoelectron. China 2011, 4, 59-64.

119. S. W. Park, K. Lee, D.-K. Lee, M. J. Ko, N.-G. Park, and K. Kim, Expanding the spectral response of a dye-sensitized solar cell by applying a selective positioning method, Nanotechnology 2011, 22, 45201.

118. J.-H. Lee, N.-G. Park, and Y.-J. Shin, Nano-grain SnO2 electrodes for high conversion efficiency SnO2-DSSC, Sol. Energy Mater. Sol. Cells 2011, 95, 179-183.

117. J.-H. Lee, W.-S. Chung, N.-G. Park, and K. Kim, Wiper coating method for PEDOT:PSS film on fabricating organic photovoltaic modules, Curr. Appl. Phys. 2010, 10, e185-e188.

116. M.-J. Kim, C.-R. Lee, W.-S. Jeong, J.-H. Im, T.-I. Ryu, and N-G. Park, Unusual enhancement of photocurrent by incorporation of Bronsted base thiourea into electrolyte of dye-sensitized solar cell, J. Phys. Chem. C 2010, 114(46), 19849-19852.

115. C. Lee, G.-W. Lee, W. Kang, D.-K. Lee, M. J. Ko, K. Kim, and N.-G. Park, Suppression of charge recombination rate in nanocrystalline SnO2 by thin coatings of divalent oxides in dye-sensitized solar cells, Bull. Korean Chem. Soc. 2010, 31(11), 3093-3098.

114. S. C. Hong, J. E. Shin, H. J. Choi, H. H. Gong, K. Kim, and N.-G Park, Prediction and evaluation of styrenic block copolymers as surface modifiers for multiwalled carbon nanotubes in α-terpineol-based pastes, Ind. Eng. Chem. Res. 2010, 49(22), 11393-11401.

113. B. Yoo, K.-J. Kim, D.-K. Lee, K. Kim, M. J. Ko, Y. H. Kim, W. M. Kim, and N.-G. Park, Method to protect charge recombination in the back-Contact dye-sensitized solar cell, Opt. Express 2010, 18(103), A395-A402.

112. K. S. Lee, H. K. Lee, D. H. Wang, N.-G. Park, J. Y. Lee, O. O. Park, and J. H. Park, Dye-sensitized solar cells with Pt- and TCO-free counter electrodes, Chem. Commun. 2010, 46, 4505-4507.

111. D. H. Yeon, K. K. Kim, N. G. Park, and Y. S. Cho, Bismuth borosilicate-based thick film passivation of Ag grid for large-area dye-sensitized solar cells, J. Am. Ceram. Soc. 2010, 93(6), 1554-1556.

110. H. J. Jo, Y. C. Choi, J.-H. Ryu, J. H. Kang, N. K. Park, D. K. Lee, and J. H. Kim, Synthesis and characterization of organic photo-sensitizers containing multi-acceptors for the application of dye-sensitized solar cells, Mol. Cryst. Liq. Cryst. 2010, 532: 55/[471]-64/[480].

109. B. Yoo, K. Kim, D.-K. Lee, M. J. Ko, H. Lee, Y. H. Kim, W. M. Kim, and N.-G. Park, Enhanced charge collection efficiency by thin-TiO2-film deposition on FTO-coated ITO conductive oxide in dye-sensitized solar cell, J. Mater. Chem. 2010, 20, 4392-4398.

108. Y. Li, K. Yoo, D.-K. Lee, J. H. Kim, N.-G. Park, K. Kim, and M. J. Ko, Highly bendable composite photoelectrode prepared from TiO2/polymer blend for low temperature fabricated dye-sensitized solar cells, Curr. Appl. Phys. 2010, 10, e171-e175.

107. S. Kim, H. Lim, K. Kim, C. Kim, T. Y. Kang, M. J. Ko, K. Kim, and N.-G. Park, Synthetic strategy of low-bandgap organic sensitizers and their photoelectron injection Characteristics, IEEE J. Sel. Top. Quantum Electron. 2010, 16(6), 1627-1634.

106. H. J. Choi, J. E. Shin, G.-W. Lee, N.-G. Park, K. Kim, and S. C. Hong, Effect of surface modification of multi-walled carbon nanotubes on the fabrication and performance of carbon nanotube based counter electrodes for dye-sensitized solar cells, Curr. Appl. Phys. 2010, 10, 165-167.

105. C. lee, W. Kang, M. J. Ko, K. Kim, and N.-G. Park, Study on the change in photovoltage by control of cell gap in dye-sensitized solar cells, J. Sol. Energy Eng. 2010, 132, 0211041-0211045.

104. N.-G. Park, Light management in dye-sensitized solar cell, Korean J. Chem. Eng. 2010, 27(2), 375-384.

103. S. Lee, I.-S. Cho, J. H. Lee, D. H. Kim, D. W. Kim, J. Y. Kim, H. Shin, J.-K. Lee, H. S. Jung, N.-G. Park, K. Kim, M. J. Ko, and K. S. Hong, Two-step sol-gel method -based TiO2 nanoparticles with uniform morphology and size for highly efficient photo-energy conversion devices, Chem. Mater. 2010, 22, 1958-1965.

102. B. Yoo, K.-J. Kim, S.-Y. Bang, M. J. Ko, K. Kim, and N.-G. Park, Chemically deposited blocking layers on FTO substrates: Effect of precursor concentration on photovoltaic performance of dye-sensitized solar cells, J. Electroanal. Chem. 2010, 638, 161-166.

101. H. Im, S. Kim, C. Park, S.-H. Jang, C.-J. Kim, K. Kim, N.-G. Park, and C. Kim, High performance organic photosensitizers for dye-sensitized solar cells, Chem. Commun. 2010, 46, 1335-1337.

100. G.-W. Lee, D. Kim, M. J. Ko, K. Kim, and N.-G. Park, Evaluation on over photocurrents measured from unmasked dye-sensitized solar cells, Sol. Energy 2010, 84, 418-425.

99. Y. J. Kim, H. J. Kim, M. H. Lee, G. I. Lim, H. Y. Song, Y. S. Choi, N.-G. Park, C. Lee, and W. I. Lee, Improvement of photovoltaic efficiency of dye-sensitized solar cell by introducing highly transparent nanoporous TiO2 buffer layer, J. Nanosci. Nanotech. 2010, 1, 340-348.

98. W.-S. Chung, H. Lee, W. Lee, M. J. Ko, N.-G. Park, B.-K. Ju, and K. Kim, Solution processed polymer tandem cell utilizing organic layer coated nano-crystalline TiO2 as interlayer, Org. Electron. 2010, 11, 521-528.

97. J. H. Koh, J. K. Koh, N.-G. Park, and J. H. Kim, Azide-induced crosslinking of electrolytes and its application in solid-state dye-sensitized solar cells, Sol. Energy Mater. Sol. Cells 2010, 94, 436-441

96. G. Vijayakumar, M. J. Lee, M. Song, S. H. Jin, J.-W. Lee, C. W. Lee, Y. S. Gal, H. J. Shim, Y. Kang, G. W. Lee, K. Kim, N.-G. Park, and S. Kim, New liquid crystal-embedded PVDF-co-HFP-based polymer electrolytes for dye-sensitized solar cell applications, Macromol. Res. 2009, 17, 963-968

95. G-W. Lee, S-Y. Bang, C. Lee, W.-M. Kim, D. Kim, K. Kim, and N.-G. Park, Structural, optical and photoelectrochemical studies on the nanodispersed titania, Curr. Appl. Phys. 2009, 9, 900-906.

94. E. S. Kwak, W. Lee, N.-G. Park, J. Kim, and H. Lee, Compact inverse opal electrode using nonaggregated TiO2 nanoparticles for dyesensitized solar cells, Adv. Funct. Mater. 2009, 19, 1093-1099.

93. K. Kim, and N.-G. Park, Improvement of electron transport by low temperature chemically-assisted sintering in dye-sensitized solar cell, J. Photochem. Photobiol. A: Chem. 2009, 204, 144-147.

92. Y. J. Kim, M. H. Lee, H. J. Kim, G. Lim, Y. S. Choi, N.-G. Park, K. Kim, and W. I. Lee, Formation of highly efficient dye-sensitized solar cells by hierarchical pore generation with nanoporous TiO2 spheres, Adv. Mater. 2009, 21, 1-6.

91. K. Lee, S.W. Park, M.J. Ko, K. Kim, and N.-G. Park, Selective positioning of organic dyes in a mesoporous inorganic oxide films, Nat. Mater. 2009, 8, 665-671.

90. M.-W. Lee, S.-B. Cha, S.-J. Yang, S. W. Park, K. Kim, N.-G. Park, and D.-H. Lee, Synthesis of organic dyes with linkers between 9,9-dimethylfluorenyl terminal and alpha-cyanoacrylic acid anchor, effect of the linkers on UV-vis absorption spectra, and photovoltaic properties in dye-sensitized solar cells, Bull. Korean Chem. Soc. 2009, 30, 2269-2279.

89. M. S. Kang, J. B. Oh, K. D. Seo, H. K. Kim, J. Park, K. Kim, and N.-G. Park, Novel extended pi-conjugated Zn(II)-porphyrin derivatives bearing pendant triphenylamine moiety for dye-sensitized solar cell: synthesis and characterization, J. Porphyr. Phthalocyanines 2009, 13, 798-804.

88. J. H. Park, S. Y. Jung, R. Kim, N.-G. Park, J. Kim, and S.-S. Lee, Nanostructured photoelectrode consisting of TiO2 hollow spheres for non-volatile electrolyte-based dye-sensitized solar cells, J. Power Sources 2009, 194, 574-578.

87. S. W. Park, K.-I. Son, M. J. Ko, K. Kim, and N.-G. Park, Effect of donor moiety in organic sensitizer on spectral response, electrochemical and photovoltaic properties, Synth. Met. 2009, 159, 2571-2577.

86. H.-J. Koo, J. Park, B. Yoo, K. Yoo, K. Kim, and N.-G. Park, Size-dependent scattering efficiency in dye-sensitized solar cell, Inorganica Chim. Acta 2008, 361, 677-683.

85. H.-J. Koo, J. Park, B. Yoo, K. Yoo, K. Kim, W. I. Lee, and N.-G. Park, Nano-embossed hollow spherical TiO2 as bifunctional material for high-efficiency dye-sensitized solar cell, Adv. Mater. 2008, 20, 195-199.

84. Y. Kim, B. Yoo, R. Vittal, Y. Lee, N.-G. Park, and K.-J. Kim, Low-temperature oxygen plasma treatment of TiO2 film for enhanced performance of dye-sensitized solar cells, J. Power Sources 2008, 175, 914-919.

83. H.-J. Koo, C. Kim, K. Kim, and N.-G. Park, Fabrication of heterosensitizer-junction dye-sensitized solar cell, Appl. Phys. Lett. 2008, 92, 142103.

82. N.-G. Park, and K. Kim, Transparent solar cells based on dye-sensitized nanocrystalline semiconductors, Physica Status Solidi (a) 2008, 205, 1895-1904.

81. J. Y. Kim, T.-H. Kim, D. Y. Kim, N.-G. Park, and K.-D. Ahn, Novel thixotropic gel electrolytes based on dicationic bis-imidazolium salts for quasi-solid-state dye-sensitized solar cells, J. Power Sources 2008, 175, 692-697.

80. B. Yoo, K. Kim, S. H. Lee, W. M. Kim, and N.-G. Park, ITO/ATO/TiO2 triple-layered transparent conducting substrates for dye-sensitized solar cells, Sol. Energy Mater. Sol. Cells 2008, 92, 873-877.

79. Y. J. Kim, Y. H. Lee, M. H. Lee, H. J. Kim, J. H. Pan, G. I. Lim, Y. S. Choi, K. Kim, N.-G. Park*, C. Lee, and W. I. Lee, Formation of efficient dye-sensitized solar cells by introducing an interfacial layer of long-range ordered mesoporous TiO2 thin film, Langmuir 2008, 24, 13225-13230.

78. P. K. Singh, K.-W. Kim, N.-G. Park, and H.-W. Rhee, Mesoporous nanocrystalline TiO2 electrode with ionic liquid-based solid polymer electrolyte for dye-sensitized solar cell application, Synth. Met. 2008, 158, 590-593.

77. P. K. Singh, K.-W. Kim, K.-I. Kim, N.-G. Park, and H.-W. Rhee, Nanocrystalline porous TiO2 electrode with ionic liquid impregnated solid polymer electrolyte for dye sensitized solar cells, J. Nanosci. Nanotechnol. 2008, 8(10), 5271-5274.

76. P. K. Singh, K.-I. Kim, N.-G. Park, and H.-W. Rhee, Dye sensitized solar cell using polymer electrolytes based on poly(ethylene oxide) with an ionic liquid, Macromol. Symp. 2007, 249-250, 162-166.

75. S. Hwang, J. H. Lee, C. Park, H. Lee, C. Kim, C. Park, M.-H. Lee, W. Lee, J. Park, K. Kim, N.-G. Park, and C. Kim, A highly efficient organic sensitizer for dye-sensitized solar cells, Chem. Commun. 2007, 46, 4887-4889

74. Y. J. Shin, J. H. Lee, J. H. Park, and N.-G. Park, Enhanced photovoltaic properties of SiO2-treated ZnO nanocrystalline electrode for dye-sensitized solar cell, Chem. Lett. 2007, 36, 1506-1507.

73. J. Park, H. J. Koo, B. Yoo, K. Yoo, K. Kim, W. Choi, and N.-G. Park, On the I-V measurement of dye-sensitized solar cell: Effect of cell geometry on photovoltaic parameters, Sol. Energy Mater. Sol. Cells 2007, 91, 1749-1754.

72. S.-M. Paek, H. Jung, Y.-J. Lee, N.-G. Park, S.-J. Hwang, and J.-H. Choy, Nanostructured TiO2 films for dye-sensitized solar cells, J. Phys. Chem. Solids 2006, 67, 1308-1311.

71. M. K. Kwang, N.-G. Park, M. G. Kang, K. S. Ryu, and S. H. Chang, Effect of TiO2 inclusion in the poly(vinylidene fluoride-co-hexafluoropropylene)-based polymer electrolyte of dye-sensitized solar cell, Bull. Korean Chem. Soc. 2006, 27, 322-324.

70. M. G. Kang, N.-G. Park, K. S. Ryu, S. H. Chang, and K.-J. Kim, A 4.2% efficient flexible dye-sensitized solar cells using stainless steel substrate, Sol. Energy Mater. Sol. Cells 2006, 90, 574-581.

69. S. K. Kim, Y.-S. Kang, J.-H. Lee, Y.-J. Shin, N.-G. Park, K. S. Ryu, and S. H. Chang, Photovoltaic properties of nano-particulate and nanorod array ZnO electrodes for dye-sensitized solar cell, Bull. Korean Chem. Soc. 2006, 27, 295-298.

68. K. M. Kim, N.-G. Park, K. S. Ryu, and S. H. Chang, Characteristics of PVdF-HFP/TiO2 composite membrane electrolytes prepared by phase inversion and conventional casting methods, Electrochim. Acta 2006, 51, 5636-5644.

67. K. M. Kim, N.-G. Park, K. S. Ryu, and S. H. Chang, Physical and electrochemical characterizations of poly(vinylidene fluoride-co-hexafluoropropylene)/SiO2-based polymer electrolytes prepared by the phase-inversion technique, J. Appl. Polym. Sci. 2006, 102, 140-148.

66. Y. Kang, N.-G. Park, and D. Kim, Hybrid solar cells with vertically aligned CdTe nanorods and a conjugated polymer, Appl. Phys. Lett. 2005, 86, 113101-113103.

65. M.-S. Kang, J. H. Kim, Y. J. Kim, J. Won, N.-G. Park, and Y. S. Kang, Dye-sensitized solar cells based on composite polymer electrolytes, Chem. Commun. 2005, 889-891.

64. M. G. Kang, N.-G. Park, K. S. Ryu, S. H. Chang, and K.-J. Kim, Flexible metallic substrates for TiO2 film of dye-sensitized solar cells, Chem. Lett. 2005, 34, 804-805.

63. K. S. Ryu, Y.-G. Lee, K. M. Kim, Y. J. Park, Y.-S. Hong, Xi. Wu, M. G. Kang, N.-G. Park, R. Y. Song, and J. M. Ko, Electrochemical capacitor with chemically polymerized conducting polymer based on activated carbon as hybrid electrodes, Synth. Met. 2005, 153, 89-92.

62. N.-G. Park, K. M. Kim, M. G. Kang, K. S. Ryu, S. H. Chang, and Y.-J. Shin, Chemical sintering of nanoparticles: A methodology of low-temperature fabrication of dye-sensitized TiO2 films, Adv. Mater. 2005, 17, 2349-2353.

61. Y.J. Shin, K.S. Kim, N.-G. Park, K.S. Ryu and S.H. Chang, Enhancement of photovoltaic properties of Ti-modified nanocrystalline ZnO electrode for dye-sensitized solar cell, Bull. Korean Chem. Soc. 2005, 26, 1929-1930.

60. N.-G. Park, M. G. Kang, K. S. Ryu, K. M. Kim, and S. H. Chang, Photovoltaic characteristics of dye-sensitized surface-modified nanocrystalline SnO2 solar cells, J. Photochem. Photobiol. A: Chem. 2004, 161, 105-110

59. J.-G. Doh, J. S. Hong, M. G. Kang, N.-G. Park, R. Vittal, and K.-J. Kim, Enhancement of photocurrent and photovoltage of dye-sensitized solar cells with TiO2 film deposited on indium zinc oxide substrate, Chem. Mater. 2004, 16, 493-497.

58. N.-G. Park, M. G. Kang, K. M. Kim, K. S. Ryu, S. H. Chang, D.-K. Kim, J. van de Lagemaat, K. Bengkstein, and A. J. Frank, Morphological and photoelectrochemical characterization of core-shell nanoparticle films for dye-sensitized solar cells: Zn-O type shell on SnO2 and TiO2 cores”, Langmuir 2004, 20, 4246-4253.

57. S.-G. Kang, K. M. Kim, N.-G. Park, K. S. Ryu, and S.-H. Chang, Factors affecting the electrochemical performance of organic/V2O5 hybrid cathode materials, J. Power Sources 2004, 133, 263-267.

56. M. G. Kang, K. M. Kim, K. S. Ryu, S. H. Chang, N.-G. Park, J. S. Hong, and K.-J. Kim, Dye-sensitized TiO2 solar cells using polymer gel electrolytes based on poly(vinylidenefluoride-co-hexafluoropropylene), J. Electrochem. Soc. 2004, 151, E257-E260.

55. M. G. Kang, K. S. Ryu, S. H. Chang, N.-G. Park, J. S. Hong, and K.-J. Kim, Dependence of TiO2 film thickness on photocurrent-voltage characteristics of dye-sensitized solar cells, Bull. Korean Chem. Soc. 2004, 25, 742-744.

54. J. H. Kim, M.-S. Kang, Y. J. Kim, J. Won, N.-G. Park, and Y. S. Kang, Dye-sensitized nanocrystalline solar cells based on composite polymer electrolytes containing fumed silica nanoparticles, Chem. Commun. 2004, 1662-1663.

53. K. S. Ryu, Y.-G. Lee, Y.-S. Hong, Y. J. Park, X. Wu, K. M. Kim, M. G. Kang, N.-G. Park, and S. H. Chang, Poly(ethylenedioxythiophene) (PEDOT) as polymer electrode in redox supercapacitor, Electrochim. Acta 2004, 50, 843-847.

52. M. G. Kang, K. S. Ryu, S. H. Chang, and N.-G. Park, New ionic liquid for redox electrolyte of dye-sensitized solar cells, ETRI J. 2004, 26(6), 647-652.

51. K. S. Ryu, Y.-G. Lee, K.-S. Han, Y. J. Park, M. G. Kang, N.-G. Park, and S. H. Chang, Electrochemical supercapacitor based on polyaniline doped with lithium salt and active carbon electrodes, Solid State Ion. 2004, 175, 765-768.

50. M. G. Kang, N.-G. Park, and S. H. Chang, Manufacturing method of transparent electric window using dye-sensitized TiO2 solar cells, Sol. Energy Mater. Sol. Cells 2003, 75, 475-479.

49. K. M. Kim, W. S. Jeon, N.-G. Park, K. S. Ryu, and S. H. Chang, Effect of evaporation temperature on the crystalline properties of solution-cast films of poly(vinylidine fluoride)s, Korean J. Chem. Eng. 2003, 20, 934-941.

48. K. M. Kim, W. S. Kim, N.-G. Park, K. S. Ryu, and S. H. Chang, Capacity and cycly performance of practical lithium polymer battery using a commercially available LiNiCoO2, J. Power Sources 2003, 123, 69-74.

47. K. M. Kim, J. M. Ko, N.-G. Park, K. S. Ryu, and S. H. Chang, Characterization of poly(vinylidenefluoride-co-hexafluoropropylene)-based polymer electrolyte filled with rutile TiO2 nanoparticles, Solid State Ion. 2003,161, 121-131.

46. N.-G. Park, J. van de Lagemaat, and A. J. Frank, Effect of morphology on electron transport in dye-sensitized nanostructured TiO2 films, J. Photoscience 2003, 10, 199-202.

45. K. S. Ryu, N.-G. Park, K. M. Kim, Y. G. Lee, Y. J. Park, S. J. Lee, C. K. Jeong, J. Joo and S. H. Chang, The physicochemical properties of polyindole/thiol composites, Synth. Met. 2003, 135-136, 397-398.

44. N.-G. Park, K M Kim, K S Ryu, Y J Park, M G Kang, D-K Kim, S-G Kang, and S-H Chang, Synthesis and electrochemical properties of V2O5 intercalated with binary polymers, J. Power Sources 2002, 103, 273-279.

43. K. S. Ryu, K. M. Kim, Y. J. Park, N.-G. Park, and S. H. Chang, Symmetric redox supercapacitor with conducting polyaniline electrodes, J. Power Sources 2002, 103, 305-309.

42. K. Zhu, E. A. Schiff, N.-G. Park, J. van de Lagemaat, and A. J. Frank, Determining the locus for photocarrier recombination in dye-sensitized solar cells, Appl. Phys. Lett. 2002, 80, 685-687.

41. M. G. Kang, N.-G. Park, S. H. Chang, S. H. Choi, and K.-J. Kim, Enhanced photocurrent of Ru(II)-dye sensitized solar cells by incorporation of titanium silicalite-2 in TiO2 film, Bull. Korean Chem. Soc. 2002, 23, 140-142.

40. Y. J. Park, K. S. Ryu, N.-G. Park, Y.-S. Hong, and S. H. Chang, Rf-sputtered vanadium oxide films: effect of film thickness on structural and electrochemical properties, J. Electrochem. Soc. 2002, 149, A597-602.

39. K. M. Kim, N.-G. Park, K. S. Ryu, and S. H. Chang, Characterization of poly(vinylidenefluoride-co-hexafluoropropylene)-based polymer electrolyte filled with TiO2 nanoparticles, Polymer 2002, 43, 3951-3957.

38. J.-H. Choy, N.-G. Park, J. B. Yoon, and H. Jung, A new intercalation complex, C60(C2H8N2)6-FeOCl, Bull. Korean Chem. Soc. 2002, 23, 1191-1192.

37. K.S. Ryu, K.M. Kim, Y.J. Park, N.-G. Park, M.G. Kang, and S.H. Chang, Redox supercapacitor using polyaniline doped with Li salt as electrode, Solid State Ion. 2002, 152-153, 861-866.

36. Y.J. Park, K.S. Ryu, K. M. Kim, N.-G. Park, M. G. Kang, and S.H. Chang, Electrochemical properties of vanadium oxide thin film deposited by RF sputtering, Solid State Ion. 2002, 154-155, 229-235.

35. S.-H. Lee, H M Cheong, N.-G. Park, C.E. Tracy, A. Mascarenhas, D.K. Benson, and S.K. Deb, Raman spectroscopic studies of Ni-W oxide films, Solid State Ion. 2001, 140, 135-139.

34. K.S. Ryu, K.M. Kim, N.-G. Park, Y.J. Park,J.H. Jeong, J. Joo, and S.H. Chang, A new approach to preparing highly conducting polyaniline films, Synth. Met. 2001, 119, 355-356.

33. N.-G. Park, S. H. Chang, and K. M. Kim, Sonochemical synthesis of the high energy density cathode material VOPO4 2H2O, Electrochem. Commun. 2001, 3, 553-556.

32. Y. J. Park, N.-G. Park, K. S. Ryu, S. H. Chang, S.-C. Park, S.-M. Yoon, and D.-K. Kim, RF-sputtered vanadium oxide thin films: effect of oxygen partial pressure on structural and electrochemical properties, Bull. Korean Chem. Soc. 2001, 22, 1015-1018.

31. J. van de Lagemaat, N.-G. Park, and A. J. Frank, Influence of electrical potential distribution, charge transport, and recombination on the photopotential and photocurrent conversion efficiency of the dye-sensitized nanocrystalline TiO2 solar cells: A study by electrical impedance and optical modulation techniques, J. Phys. Chem. B 2000, 104, 2044-2052.

30. N. Kopidakis, E. A. Schiff, N.-G. Park, J. van de Lagemaat, and A.J. Frank, Ambipolar diffusion of photocarriers in electrolyte-filled nanoporous TiO2, J. Phys. Chem. B 2000, 104, 3930-3936.

29. J.-H. Choy, Y.-I. Kim, B.-W Kim, N.-G. Park, G. Campet, and J.-C. Grenier, New solution route to electrochromic polyacrylic acid/WO3 hybrid film, Chem. Mater. 2000, 12, 2950-2956.

28. N.-G. Park, J. van de Lagemaat, and A. J. Frank, Comparison of dye-sensitized rutile- and anatase-based TiO2 solar cells, J. Phys. Chem. B 2000, 104, 8989-8994.

27. N.-G. Park, S. H. Chang, J. van de Lagemaat, K.J. Kim, and A. J. Frank, Effect of cations on the open-circuit photovoltage and the charge-injection efficiency of dye-sensitized nanocrystalline rutile TiO2 films, Bull. Korean Chem. Soc. 2000, 21, 985-988.

26. G. Schlichthorl, N.-G. Park, and A. J. Frank, Evaluation of the charge-collection efficiency of dye-sensitized nanocrystalline TiO2 solar cell, J. Phys Chem. B 1999, 103, 782-791.

25. N.-G. Park*, G. Schlichtorl, J. van de Lagemaat, H. M. Cheong, A. Mascarenhas, and A. J. Frank, Dye-sensitized TiO2 solar cells: structural and photoelectrochemical characterization of nanocrystalline electrodes formed from the hydrolysis of TiCl4, J. Phys. Chem. B 1999, 103, 3308-3314.

24. M.A. Ibrahim, B.-G. Lee, N.-G. Park, J.R. Pugh, D.D. Eberl, and A.J. Frank, Synthesis of new oligothiophene derivatives and their intercalation compounds: orientation effects, Synth. Met. 1999, 105, 35-42.

23. G. Schlichthorl, N.-G. Park, and A.J. Frank, Estimation of the charge-collection efficiency of dye-sensitized nanocrystalline TiO2 solar cells, J. Phys. Chem. 1999, 212, 45-50.

22. S.K. Deb, R. Ellingson, S. Ferrere, A.J. Frank, B.A. Gregg, A.J. Nozik, and N.-G. Park, G. Schlichthrol, A. Zaban, Photochemical solar cell based on dye-sensitization of nanocrystalline TiO2, AIP Conf. Proc. 1999, 462, 473-482.

21. S.-J. Hwang, N.-G. Park, D.-H. Kim, and J.-H. Choy, Charge transfer-Tc relation in superconducting intercalates IBi2Sr2CaCu2Oy, J. Solid State Chem. 1998, 138, 66-73.

20. N.-G. Park, B.W Kim, A. Poquet, G. Campet, J. Portier, J.-H. Choy, and Y.-I. l Kim, A new and simple method for manufacturing electrochromic tungsten oxide films, Active Passive Elec. Comp. 1998, 20, 125-133.

19. N.-G. Park, A. Poquet, G. Campet, J. Portier, J.-H. Choy, Y.-I. Kim, D. Camino, and J. Salardenne, Development of electrochromic devices working with hydrophobic lithium electrolyte, Active Passive Elec. Comp. 1998, 20, 201-213.

18. J.-H. Choy, S.-J. Hwang, and N.-G. Park, Interacrystalline structure of molecular mercury halide intercalated in high-tc superconducting lattice of Bi2Sr2CaCu2Oy, J. Am. Chem. Soc. 1997, 119, 1624-1633

17. J.-H. Choy, N.-G. Park, J.-B. Yoon, K.-S. Han, and S.-H. Chang, The effect of lithium intercalation on the crystal structure and magnetic property of layered FeWO4Cl, Jpn. J. Appl. Phys. 1997, 36, 2656-2660

16. J.-H. Choy, J.-B. Yoon, N.-G. Park, Y.-I Kim and K.-S. Han, X-ray absorption spectroscopic studies on layered FeWO4Cl and its lithium intercalates, Jpn. J. Appl. Phys. 1997, 36, 5605-5609.

15. Y.-I. Kim, B.-W. Kim, J.-H. Choy, G. Campet, N.-G. Park, J. Portier, and B. Morel, RF sputtered lithium nickel oxide films and their electrochromism, J. Korean Chem. Soc. 1997, 41, 594-599.

14. J.-H. Choy, N.-G. Park, S.-J. Hwang, and Z.G. Khim, Evolution of superconducting transition temperature (Tc) upon HgBr2 intercalation into Bi2Sr1.5-xLaxCa1.5Cu2Oy, J. Phys. Chem. 1996, 100, 3783.

13. N.-G. Park, S.-W. Cho, S.-J. Kim and J.-H. Choy, X-ray absorption near edge structure (XANES) of the iodine intercalated C60: evidence of I2d+ in I2C60, Chem. Mater. 1996, 8, 324-326.

12. M.-K. Bae, M.-S. Kim, S.-I. Lee, N.-G. Park, S.-J. Hwang, D.-H. Kim, and J.-H. Choy, Effect of HgI2 intercalation on Bi2Sr2CaCu2Oy: interlayer coupling effect, Phys. Rev. B 1996, 53, 12416-12421.

11. J.-H. Choy, N.-G. Park, S.-J. Hwang, S.-H. Hwang, and D.-H. Kim, X-ray absorption spectroscopic study of new high-Tc superconducting intercalation compounds of (HgX2)0.5Bi2Sr2CaCu2Oy (X=Br, I), Proc. SPIE 1996, 2696, 636-641.

10. J.-H. Choy, Y.-I. Kim, N.-G. Park, and S.-H. Hwang, Nano-engineering via intercalation: layer-by-layer interstratification of high-Tc superconducting and superionic materials, AgxIwBi2Sr2Can-1CunO2n+4 (n=1, 2, 3), Proc. SPIE 1996, 2697, 403-412.

9. J.-H. Choy, N.-G. Park, Y.-I. Kim, S.-H. Hwang, J.-S. Lee, and H.-I. Yoo, Molecular layer-by-layer engineering of superconducting and superionic materials in the (AgI)Bi2Sr2CaCu2Oy system, J. Phys. Chem. 1995, 99, 7845-7848.

8. J.-H. Choy, S.-T. Hong, N.-G. Park, S.-H. Byeon, and G. Demazeau, Pressure dependence of the oxidation state of manganese and magnetic property of CaLaMgMnO6-x, Bull. Korean Chem. Soc. 1995, 16, 105-110.

7. J.-H. Choy, N.-G. Park, S.-J. Hwang, and Y.-I Kim, A new high-tc superconducting intercalation compound, Synth. Met. 1995, 71, 1551-1553.

6. J.-H. Choy, N.-G. Park, and D.-Y. Noh, A new 2-dimensional magnetic model for the layered compounds of FeMO4Cl (M=Mo and W) with strong interlayer coupling, Synth. Met. 1995, 71, 2055-2056.

5. J.-H. Choy, Y.-S. Han, N.-G. Park, H. Kim, and S.-W. Kim, N-alkylammonium intercalated 2-d titanates and their thermotropic phase transition, Synth. Met. 1995, 71, 2053-2054.

4. J.-H. Choy, N.-G. Park, S.-H. Chang, and H.-H. Park, Electronic structure of iron and molybdenum in Li2FeMoO4Cl and its crystal symmetry, J. Korean Chem. Soc. 1995, 39, 446-452.

3. J.-H. Choy, N.-G. Park, Y.-I. Kim, and Chy-Hyung Kim, New mixed nanocomposites, (AgI)xBi2Sr2CaCu2Oy, Eur. J. Solid State Inorg. Chem. 1995, 32, 701-709.

2. J.-H. Choy, N.-G. Park, S.-J. Hwang, D.-H. Kim, and N.H. Hur, New superconducting intercalation compounds: (HgX2)0.5Bi2Sr2CaCu2Oy (X=Br and I), J. Am. Chem. Soc. 1994, 116, 11564-11565.

1. J.-H. Choy, D.-K. Kim, N.-G. Park, D.-H. Kim, S.-J. Hwang, S.-H. Hwang, and N.H. Hur, XANES and EXAFS studies on a new superconducting intercalation compound, AgIBi2Sr2CaCu2Oy, Physica C 1994, 235-240, 1023-1024.