Journal Article

Stable and low-photovoltage-loss perovskite solar cells by multifunctional passivation

Guojia, Fang, Liu, Kuan, So Shu Kong, Ye Feihong, Li, Gang, Wang, Xin, Lu, Xinhui, Shi, Tingting, Zhang Hengkai, Li, Siqi, Chen Yuxuan, Dangyuan, Lei, Yin Hang, Wang, Jianbo, Hou Jianhui, Ren Zhiwei, Qin Minchao, Liang Jiwei, Yang, Yang, Wu, Hongbin, Gao Bowei, Yang, Guang, Wang, Haibing, Deng Wanyuan, Liang Qiong, Zhuang Yuanlin

2021

Overview

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 WOC (ΔVOC,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.The use of a dimensionally graded 2D perovskite interface and passivation results in perovskite solar cells with very low photovoltage loss.

• Publisher: Nature Publishing Group
• Subject: Defects / Energy conversion efficiency / Metal halides / Open circuit voltage / Passivity / Perovskites / Photovoltaic cells / Radiative recombination / Recombination / Solar cells / Voltage