Rao Li, Meng Xiangchuan, Xiao Shuqin, Xing Zhi, Fu Qingxia, Wang Hongyu, Gong Chenxiang, Hu Ting, Hu Xiaotian, Guo Rui, Chen Yiwang
School of Materials Science and Engineering, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031, China.
Institute of Polymers and Energy Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031, China.
Angew Chem Int Ed Engl. 2021 Jun 21;60(26):14693-14700. doi: 10.1002/anie.202104201. Epub 2021 May 17.
Tin-based perovskite solar cells (PSCs) demonstrate a potential application in wearable electronics due to its hypotoxicity. However, poor crystal quality is still the bottleneck for achieving high-performance flexible devices. In this work, graphite phase-C N (g-C N ) is applied into tin-based perovskite as a crystalline template, which delays crystallization via a size-effect and passivates defects simultaneously. The double hydrogen bond between g-C N and formamidine cation can optimize lattice matching and passivation. Moreover, the two-dimensional network structure of g-C N can fit on the crystals, resulting an enhanced hydrophobicity and oxidation resistance. Therefore, the flexible tin-based PSCs with g-C N realize a stabilized power conversion efficiency (PCE) of 8.56 % with negligible hysteresis. In addition, the PSCs can maintain 91 % of the initial PCE after 1000 h under N environment and keep 92 % of their original PCE after 600 cycles at a curvature radius of 3 mm.
锡基钙钛矿太阳能电池（PSCs）因其低毒性而在可穿戴电子设备中显示出潜在的应用前景。然而，晶体质量差仍然是实现高性能柔性器件的瓶颈。在这项工作中，石墨相氮化碳（g-C₃N₄）被用作锡基钙钛矿的晶体模板，它通过尺寸效应延迟结晶并同时钝化缺陷。g-C₃N₄与甲脒阳离子之间的双氢键可以优化晶格匹配并实现钝化。此外，g-C₃N₄的二维网络结构可以与晶体契合，从而增强疏水性和抗氧化性。因此，含有g-C₃N₄的柔性锡基PSCs实现了8.56%的稳定功率转换效率（PCE），滞后现象可忽略不计。此外，该PSCs在氮气环境下1000小时后可保持初始PCE的91%，在曲率半径为3毫米的条件下经过600次循环后可保持其原始PCE的92%。
