北京航空航天大学张晓亮团队报道了效率为21.86%的偶极化学桥诱导CsPbI₃钙钛矿太阳能电池。相关研究成果发表在2024年3月4日出版的国际学术期刊《德国应用化学》。

CsPbI₃钙钛矿由于其理想的带隙和良好的热稳定性而在光伏应用中受到极大关注。然而，CsPbI₃钙钛矿太阳能电池（PSCs）由于PSCs内严重的界面能损失而显著存在光电压缺陷，这在很大程度上影响了PSCs的光伏性能。

该文中，在钙钛矿层和TiO₂层之间构建了偶极化学桥（DCB），以降低界面能量损失，从而改善PSCs的电荷提取。结果表明，DCB可以在钙钛矿和TiO₂层之间形成有益的界面偶极子，这可以优化钙钛矿/TiO₂层的界面能量学，从而改善PSCs内的能级排列。

同时，所构建的DCB还可以同时钝化钙钛矿和TiO₂层的表面缺陷，大大降低界面复合。因此，PSCs的光电压不足大大减少，从而实现了21.86%的记录效率。同时，由于在PSCs内形成DCB后获得了具有释放的界面拉伸应变的高质量钙钛矿膜，PSCs的运行稳定性也大大提高。

附：原文原文

Title: Dipolar Chemical Bridge Induced CsPbI3 Perovskite Solar Cells with 21.86% Efficiency

Author: Junming Qiu, Xinyi Mei, Mingxu Zhang, Guoliang Wang, Shengwen Zou, Long Wen, Jianmei Huang, Yong Hua, Xiaoliang Zhang

Issue&Volume: 2024-03-04

Abstract: CsPbI3 perovskite receives tremendous attention for photovoltaic applications due to its ideal bandgap and good thermal stability. However, CsPbI3 perovskite solar cells (PSCs) significantly suffer from photovoltage deficits because of serious interfacial energy losses within the PSCs, which to a large extent affects the photovoltaic performance of PSCs. Herein, a dipolar chemical bridge (DCB) is constructed between the perovskite and TiO2 layers to lower interfacial energy losses and thus improve the charge extraction of PSCs. The results reveal that the DCB could form a beneficial interfacial dipole between the perovskite and TiO2 layers, which could optimize the interfacial energetics of perovskite/TiO2 layers and thus improve the energy level alignment within the PSCs. Meanwhile, the constructed DCB could also simultaneously passivate the surface defects of perovskite and TiO2 layers, greatly lowering interfacial recombination. Consequently, the photovoltage deficit of PSCs is largely reduced, leading to a record efficiency of 21.86% being realized. Meanwhile, the operation stability of PSCs is also largely improved due to the high-quality perovskite films with released interfacial tensile strain being obtained after forming the DCB within the PSCs.

DOI: 10.1002/anie.202401751

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202401751