Critical Role of Grain Boundaries for Ion Migration in Formamidinium and Methylammonium Lead Halide Perovskite Solar Cells

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• 作者：Jae S. Yun ; Jan Seidel ; Jincheol Kim ; Arman Mahboubi Soufiani ; Shujuan Huang ; Jonathan Lau ; Nam Joong Jeon ; Sang Il Seok ; Martin A. Green and Anita Ho-Baillie
• 刊名：Advanced Energy Materials
• 出版年：2016
• 出版时间：July 6, 2016
• 年：2016
• 卷：6
• 期：13
• 全文大小：9205K
• ISSN：1614-6840

文摘

The critical role of grain boundaries for (CH(NH₂)₂PbI₃)_0.85(CH₃NH₃PbBr₃)_0.15 perovskite solar cells studied by Kelvin probe force microscopy under bias voltage and illumination is reported. Ion migration is enhanced at the grain boundaries. Under illumination, the light-induced potential causes ion migration leading to a rearranged ion distribution. Such a distribution favors photogenerated charge-carrier collection at the grain boundaries.