Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
CH3NH3PbI3 Perovskite Solar Cell with Efficiency Exceeding 17%
Jeong-Hyeok Im,1 In-Hyuk Jang,1 Michael Grätzel2 and Nam-Gyu Park1*
1School of Chemical Engineering and Department of Energy Science, Sungkyunkwan University (SKKU), Suwon 440-746, Korea
2Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
Perovskite solar cells with average power conversion efficiency (PCE) of more than 16% and best PCE exceeding 17% are prepared by controlling size of crystal CH3NH3PbI3. Two-step spin coating procedure is adapted for preparing CH3NH3PbI3 and concentration of CH3NH3I solution is varied to control size of perovskite crystal. Crystal growth is observed when concentration is lowered. Photovoltaic performance is found to be significantly influenced by the size of perovskite. Photocurrent is in general increased as the size is increased, while photovoltage tends to be decreased with increasing the size. Increase in photocurrent with size is attributed to the increased optical absorption. Change in the photovoltage is related to change in absorption coefficient near bandgap. Fill factors as high as 0.74 are obtained upon increasing the size of perovskite larger than 200 nm, whereas they are declined as the size is decreased. Dependence of fill factor on the size of perovskite is related to change in series resistance, where series resistance is gradually decreased with increasing the size. Change in series resistance is in part related to number of grain boundaries. The best PCE of 17.01% is obtained from the perovskite cuboid grown from the concentration lower than 0.050 M CH3NH3I.
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