Orientation Manipulation and Defect Passivation for Perovskite Solar Cells by a Natural Compound

This study reveals that tea saponin (TS), a natural compound serves as a SnO2 modifier, facilitates optimal growth of perovskite crystals on the (111) facet. The modification promotes preferential crystal orientation through hydrogen bond and Lewis coordination. TS forms a chelate with SnO2, resulting in a smoother film and n-type doping, leading to improved carrier extraction and reduced defects. The TS-modified perovskite solar cells achieve a champion efficiency of 24.2%, leveraging from an obvious enhancement of open-circuit voltage (Voc) of 1.18  V and fill factor (FF) of 82.8%. The devices also demonstrate enhanced humidity tolerance and storage stability, ensuring improved stability without encapsulation.

Source: Small - April 16, 2024 Category: Nanotechnology Authors: Yunfei Ouyang, Zeping Ou, Ibrahim Mwamburi Mwakitawa, Tianyu Xia, Yi Pan, Can Wang, Qin Gao, Bo Zhang, Kun Chen, Zijuan He, Tatyana Shumilova, Bing Guo, Yujie Zheng, Tingming Jiang, Zhu Ma, Kuan Sun Tags: Research Article Source Type: research