Grain Boundaries Contribute to the Performance of Perovskite Solar Cells by Promoting Charge Separations (IMAGE)
Caption
- Sub-micrometer-resolved photocurrent mapping in operational perovskite solar cells, achieved through our home-built photoluminescence and photocurrent imaging microscopy, reveals enhanced photocurrent at grain boundaries compared to grain interiors.
- Local pump-probe femtosecond transient absorption and Kelvin probe force microscopy measurements corroborate the presence of a built-in electric field in the vicinity of grain boundaries that promotes electron–hole separation and the subsequent charge collection, thereby contributing to the performance of perovskite solar cells.
Credit
Peng Xu, Pengfei Wang, Minhuan Wang, Fengke Sun, Jing Leng, Yantao Shi, Shengye Jin, Wenming Tian.
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CC BY-NC-ND