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Stable and low-photovoltage-loss perovskite solar cells by multifunctional passivation
Nature Photonics  (IF38.771),  Pub Date : 2021-07-05, DOI: 10.1038/s41566-021-00829-4
Guang Yang, Zhiwei Ren, Kuan Liu, Minchao Qin, Wanyuan Deng, Hengkai Zhang, Haibing Wang, Jiwei Liang, Feihong Ye, Qiong Liang, Hang Yin, Yuxuan Chen, Yuanlin Zhuang, Siqi Li, Bowei Gao, Jianbo Wang, Tingting Shi, Xin Wang, Xinhui Lu, Hongbin Wu, Jianhui Hou, Dangyuan Lei, Shu Kong So, Yang Yang, Guojia Fang, Gang Li

Metal halide perovskite solar cells have demonstrated a high power conversion efficiency (PCE), and further enhancement of the PCE requires a reduction of the bandgap-voltage offset (WOC) and the non-radiative recombination photovoltage loss (ΔVOC,nr). Here, we report an effective approach for reducing the photovoltage loss through the simultaneous passivation of internal bulk defects and dimensionally graded two-dimensional perovskite interface defects. Through this dimensionally graded perovskite formation approach, an open-circuit voltage (VOC) of 1.24 V was obtained with a champion PCE of 21.54% in a 1.63 eV perovskite system (maximum VOC = 1.25 V, WOC = 0.38 V and ΔVOC,nr = 0.10 V); we further decreased the WOC to 0.326 V in a 1.53 eV perovskite system with a VOC of 1.21 V and a PCE of 23.78% (certified 23.09%). This approach is equally effective in achieving a low WOCVOC,nr) in 1.56 eV and 1.73 eV perovskite solar cell systems, and further leads to the substantially improved operational stability of perovskite solar cells.