1. High‐Efficiency Perovskite Solar Cells with Imidazolium‐Based Ionic Liquid for Surface Passivation and Charge Transport.
- Author
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Zhu, Xuejie, Du, Minyong, Feng, Jiangshan, Wang, Hui, Xu, Zhuo, Wang, Likun, Zuo, Shengnan, Wang, Chenyu, Wang, Ziyu, Zhang, Cong, Ren, Xiaodong, Priya, Shashank, Yang, Dong, and Liu, Shengzhong (Frank)
- Subjects
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SILICON solar cells , *SURFACE passivation , *SURFACE charges , *SOLAR cells , *LIQUID surfaces , *PEROVSKITE - Abstract
Surface defects have been a key constraint for perovskite photovoltaics. Herein, 1,3‐dimethyl‐3‐imidazolium hexafluorophosphate (DMIMPF6) ionic liquid (IL) is adopted to passivate the surface of a formamidinium‐cesium lead iodide perovskite (Cs0.08FA0.92PbI3) and also reduce the energy barrier between the perovskite and hole transport layer. Theoretical simulations and experimental results demonstrate that Pb‐cluster and Pb‐I antisite defects can be effectively passivated by [DMIM]+ bonding with the Pb2+ ion on the perovskite surface, leading to significantly suppressed non‐radiative recombination. As a result, the solar cell efficiency was increased to 23.25 % from 21.09 %. Meanwhile, the DMIMPF6‐treated perovskite device demonstrated long‐term stability because the hydrophobic DMIMPF6 layer blocked moisture permeation. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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