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Radical Form of PbI2: A New Defect Passivator for Efficient Perovskite Solar Cells
journal contribution
posted on 2021-09-24, 15:04 authored by XiuXiu Feng, Jiyao Wei, Xiaodong Li, Wenxiao Zhang, Xiaoyan Zhao, Chunyan Lu, Xuemin Guo, Junfeng FangPbI2 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.
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perovskite solar cellscommonly used passivatoralso greatly improved85 ° cpoor conductivity naturemagnitude higher conductivitynew defect passivator2 subhigh conductivityn defect passivationpscs ).passivate defectsmay limitinitial efficiencyimpressively increasedefficient pscsdevice stabilitydevice performanceachieved owing>′- tetramethylbenzidine63 %.600 h4 orders