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Radical Form of PbI2: A New Defect Passivator for Efficient Perovskite Solar Cells

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journal contribution
posted on 24.09.2021, 15:04 by XiuXiu Feng, Jiyao Wei, Xiaodong Li, Wenxiao Zhang, Xiaoyan Zhao, Chunyan Lu, Xuemin Guo, Junfeng Fang
PbI2 is a commonly used passivator for defect passivation in perovskite solar cells (PSCs). However, the poor conductivity nature of PbI2 may limit the further improvement of device performance. Here, we report a radical form of PbI2 with high conductivity to passivate defects for efficient PSCs through a combination of N,N,N′,N′-tetramethylbenzidine (TMB). When PbI2 is combined with TMB, 4 orders of magnitude higher conductivity will be achieved owing to the formation of a TMB-PbI2 radical. As a result, the device performance is impressively increased from 20.48 to 22.63%. In addition, the device stability is also greatly improved and 95% of the initial efficiency is retained after aging at 85 °C for 600 h.