Methylammonium (MA)-free perovskite solar cells (PVSCs) have obtained great attention recently, owing to their superior stability. However, there are still gaps in efficiency between MA-free PVSCs and MA-containing counterparts. Their stability still needs to be further enhanced for meeting commercial standards, especially the illumination stability. Here, we incorporate Zn2+ into perovskite thin films to passivate defects, successfully achieving a champion efficiency of 20.7% and reinforcing the stability of MA-free FA0.9Cs0.1PbI3 PVSCs. This study reveals that Zn-doping can increase the grain size and contribute to modulate the crystallization process. Moreover, it is found that most of the Zn2+ aggregates at the grain boundaries passivating defects and, thus, effectively restrain the non-radiative recombination in the PVSCs. These findings provide a new way of realizing highly efficient and stable PVSCs.
Effects of ZnI2 doping on the performance of methylammonium-free perovskite solar cells
Lei Yan, Zhenchao Li, Tianqi Niu, Xiang Xu, Shenkun Xie, Guanping Dong, Qifan Xue, Hin-Lap Yip; Effects of ZnI2 doping on the performance of methylammonium-free perovskite solar cells. J. Appl. Phys. 28 July 2020; 128 (4): 043102. https://doi.org/10.1063/5.0012370
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