Hot-substrate assisted deposition for Cs-rich ?-Cs1-xFAxPbI2Br (0? x? 0.4) films

作者：He, Qinghe; Jiang, Zhikang; Li, Deguan; Tian, Nan^*; Yao, Disheng; Zheng, Guoyuan; Wang, Jilin^*; Zhou, Bing; Long, Fei^*

来源：Solar Energy, 2022, 238: 126-131.

DOI：10.1016/j.solener.2022.04.018

• Cs-rich a-Cs(1-x)FA(x)PbI(2)Br (0=x=0.4)
• Hot-substrate
• Impurity-free phase
• Humidity stability
• Light stability

The mixed cation FA(x)Cs(1_x)PbI(2)Br has shown great promise for the top subcell of tandem solar cells owing to its improved thermal and moisture stability. However, most studies of FA(x)Cs(1_x)PbI(2)Br focus on FA-rich perovskites. Duo to the phase separation when Cs > 30%, there is still room for improvement of Cs-richFA(x)Cs(1_x)PbI(2)Br. In this work, by hot-substrate assisted deposition, Cs-rich alpha-Cs1_xPbI2Br (0 < x < 0.4) films without impure phase were synthesized. Compared with alpha-CsPbI2Br film, the humidity stability of alpha-Cs1-xFAxPbI2Br (0 < x < 0.4) films was effectively enhanced. The highest power conversion efficency of 12.3% with open-circuit voltage (Voc) of 1.16 V, current intensity (Jsc) of 14.5 mA/cm(- 2) and fill factor of 72.3% in alpha-Cs(0.7)FA(0.3)PbI(2)Br solar cell was achieved. The alpha-Cs(1-x)FA(x)PbI(2)Br (0 <= x <= 0.4) films after FA incorporation still maintain good thermal and UV irradiation stability. It showed a great potential of the Cs-rich perovskite for future application.

• 单位
  桂林理工大学