近日，昆明理工大学材料科学与工程学院陈江照教授团队在化学顶刊《Angewandte Chemie International Edition》上以“Converting Residual Unstable PbI2 into Robust 2D Perovskite via Spacer Cation Engineering toward Operationally Stable Perovskite Solar Cells”为题发表最新研究成果，昆明理工大学和西南石油大学联合培养博士邓路为论文的第一作者，昆明理工大学陈江照教授、何冬梅教授和大湾区大学于华教授为论文的共同通讯作者。该研究工作得到国家自然科学基金面上、地区科学基金、兵团重点领域科技攻关计划等项目的资助。

解决由残留碘化铅诱导的光不稳定性对同时实现高的功率转换效率和优异的稳定性至关重要。鉴于此，昆明理工大学陈江照教授、何冬梅教授团队报道了一种基于维度工程的残留光活性碘化铅的有效管理策略。采用胍法辛盐酸盐（GUFCl）作为添加剂或者界面修饰剂调控钙钛矿薄膜，将晶界残留碘化铅转化为稳定的二维钙钛矿，抑制钙钛矿薄膜的光分解、抑制离子迁移和稳定钙钛矿晶界。形成的二维钙钛矿能够降低缺陷密度、促进载流子传输与提取，从而减轻载流子非辐射复合。结果，基于GUFCl的p-i-n反式钙钛矿电池实现了26.19%的冠军效率。未封装的反式钙钛矿电池表现出优异的运行稳定性，在最大功率点持续工作1100小时后仍然保留出实效效率的92%。本工作提供了一种简单而有效的方法来解决残留碘化铅诱导的本征不稳定性问题，旨在实现高效运行稳定的钙钛矿光伏技术。

Figure 1. Characterizations of formed 2D perovskites after incorporating GUFCl. Top-view SEM images of FACs-based perovskite films a) without (control) and b) with GUFCl additive in inverted PSCs. Top-view SEM images of FACsRb-based perovskite films c) without (control) and d) with GUFCl post-treatment in regular PSCs. GIWAXS patterns of FACs-based perovskite films e) without (control) and f) with (target) GUFCl addition in inverted PSCs. GIWAXS patterns of FACsRb-based perovskite films g) without (control) and h) with (target) GUFCl post-treatment in regular PSCs. i) XRD spectra of the FACsRb-based perovskite films with different interface molecules. j) Schematic depiction of the GUFCl-induced conversion of residual PbI2 to 2D perovskite phases.

论文链接：

Lu Deng, Xinxing Liu, Yue Yu, Shenchao Li, Xuxia Shai, Meirong Fu, Xingyu Gao, Xiaopeng Zhang, Dongmei He*, Hua Yu*, Jiangzhao Chen*. Converting residual unstable PbI2 into robust 2D perovskite via spacer cation engineering toward operationally stable perovskite solar cells. Angewandte Chemie International Edition 2025, e202516433

https://onlinelibrary.wiley.com/doi/10.1002/anie.202516433