American Chemical Society
nz1c01878_si_001.pdf (1.32 MB)

Mixed-Phase Low-Dimensional Perovskite-Assisted Interfacial Lead Directional Management for Stable Perovskite Solar Cells with Efficiency over 24%

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journal contribution
posted on 2021-11-15, 22:38 authored by Guozhen Liu, Haiying Zheng, Jiajiu Ye, Shendong Xu, Liying Zhang, Huifen Xu, Zheng Liang, Xiaojing Chen, Xu Pan
The efficiency and stability of perovskite solar cells are affected by the Pb–I antisite and uncoordinated Pb0 defects existing at the interface. Directional management of Pb-based defects can reduce the defect density and voltage loss. In this work, to settle the Pb-based defects at the interface for further stabilization of the perovskite surface, we propose the strategy of designing a low-dimensional perovskite (LDP) by an amphoteric heterocyclic cation which can increase the defect formation energies and inhibit the generation of Pb–I antisite defects. The growth of the mixed-phase LDP can introduce a strong interaction with undercoordinated Pb2+ upon the surface of peroskite films accomplished with the ability of dealing with different types of surface-terminating ends. The modified devices showed an increased efficiency of 24.07% (stabilized efficiency of 23.25%) as well as improved overall stability. This opens up a direction for prompting the practical application of perovskite photovoltaic devices based on the directional management of Pb-based interface defects.