Perovskite Solar Cells with Efficiency over 16%
Nam-Gyu Park a
a Sungkyunkwan University, South Korea, 300 Cheoncheon-dong, Jangan-gu, Suwon, 440, Korea, Republic of
International Conference on Hybrid and Organic Photovoltaics
Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Ecublens, Switzerland, 2014 May 11th - 14th
Organizers: Michael Graetzel and Mohammad Nazeeruddin
Keynote, Nam-Gyu Park, presentation 055
Publication date: 1st March 2014

Perovskite solar cell based on organolead halide has been considered as a promising photovoltaic technology and regarded as a potential alternative to silicon or CIGS solar cells. In this talk, technologies for perovskite solar cells with power conversion efficiency more than 16% are presented. The first version of long-term durable perovskite solar cell was developed by Kim. et al. in 2012, which demonstrated 9.7%. In 2013, PCE of 15% was achieved by Gratzel and Snaith groups. But, the average PCE was as low as 12%. Deposition method was found to be critical to high efficiency devices. We compare the photovoltaic performance of methylammonium lead iodide perovskite solar cells prepared by one-step and two-step deposition methods, where one-step showed low PCE of about 8-9%, on the other hands, two-step methods showed higher PCE with average value of more than 15% and best value of 17%. Substitution of other organic cations for methylammonium led to lower band gap and higher absorption coefficient, which consequently resulted in PCE of 16% and average PCE of 15.5% with better photostability and no I-V hysteresis.



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