Key Laboratory for Biobased Materials and Energy of Ministry of Education, Guangdong Laboratory for Lingnan Modern Agriculture, College of Materials and Energy, South China Agricultural University, No. 483 Wushan Road, Guangzhou, 510642, China.
Institute of Environmental Research at Greater Bay Area, Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, No. 230 West Waihuan Road, Higher Education Mega Center, Guangzhou, 510006, China.
Angew Chem Int Ed Engl. 2023 Jun 19;62(25):e202303486. doi: 10.1002/anie.202303486. Epub 2023 May 11.
Defects in perovskite are key factors in limiting the photovoltaic performance and stability of perovskite solar cells (PSCs). Generally, choline halide (ChX) can effectively passivate defects by binding with charged point defects of perovskite. However, we verified that ChI can react with CsPbI to form a novel crystal phase of one-dimensional (1D) ChPbI , which constructs 1D/3D heterostructure with 3D CsPbI , passivating the defects of CsPbI more effectively and then resulting in significantly improved photoluminescence lifetime from 20.2 ns to 49.4 ns. Moreover, the outstanding chemical inertness of 1D ChPbI and the repair of undesired δ-CsPbI deficiency during its formation process can significantly enhance the stability of CsPbI film. Benefiting from 1D/3D heterostructure, CsPbI carbon-based PSCs (C-PSCs) delivered a champion efficiency of 18.05 % and a new certified record of 17.8 % in hole transport material (HTM)-free inorganic C-PSCs.
钙钛矿中的缺陷是限制钙钛矿太阳能电池（PSC）光伏性能和稳定性的关键因素。通常情况下，胆碱卤化物（ChX）可以通过与钙钛矿的带电点缺陷结合，有效地钝化缺陷。然而，我们验证了 ChI 可以与 CsPbI 反应，形成一维（1D）ChPbI 的新型晶体相，与 3D CsPbI 构建 1D/3D 异质结构，更有效地钝化 CsPbI 的缺陷，从而导致光致发光寿命从 20.2 ns 显著提高到 49.4 ns。此外，1D ChPbI 的卓越化学惰性和其形成过程中修复不理想的 δ-CsPbI 缺乏，可以显著提高 CsPbI 薄膜的稳定性。得益于 1D/3D 异质结构，CsPbI 碳基 PSCs（C-PSCs）在无空穴传输材料（HTM）的无机 C-PSCs 中实现了 18.05%的冠军效率和 17.8%的新认证记录。
