Tan Shan, Yu Bingcheng, Cui Yuqi, Meng Fanqi, Huang Chunjie, Li Yiming, Chen Zijing, Wu Huijue, Shi Jiangjian, Luo Yanhong, Li Dongmei, Meng Qingbo
Key Laboratory for Renewable Energy, Chinese Academy of Sciences (CAS), Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Beijing, 100190, China.
College of Materials Science and Opto-Electronic Technology, University Chinese Academy of Sciences, Beijing, 100049, China.
Angew Chem Int Ed Engl. 2022 Jun 7;61(23):e202201300. doi: 10.1002/anie.202201300. Epub 2022 Apr 5.
Low-dimensional (LD) perovskites can effectively passivate and stabilize 3D perovskites for high-performance perovskite solar cells (PSCs). Regards CsPbI -based PSCs, the influence of high-temperature annealing on the LD perovskite passivation effect has to be taken into account due to fact the black-phase CsPbI crystallization requires high-temperature treatment, however, which has been rarely concerned so far. Here, the thermal stability of LD perovskites based on three hydrophobic organic ammonium salts and their passivation effect toward CsPbI and the whole device performance, have been investigated. It is found that, phenyltrimethylammonium iodide (PTAI) and its corresponding LD perovskites exhibit excellent thermal stability. Further investigation reveals that PTAI-based LD perovskites are mainly distributed at grain boundaries, which not only enhances the phase stability of CsPbI but also effectively suppresses non-radiative recombination. As a consequence, the champion PSC device based on CsPbI exhibits a record efficiency of 21.0 % with high stability.
低维（LD）钙钛矿能够有效地钝化和稳定三维钙钛矿，以用于高性能钙钛矿太阳能电池（PSC）。对于基于CsPbI的PSC，由于黑色相CsPbI的结晶需要高温处理，因此必须考虑高温退火对LD钙钛矿钝化效果的影响，然而，到目前为止这一点很少受到关注。在此，研究了基于三种疏水性有机铵盐的LD钙钛矿的热稳定性及其对CsPbI的钝化效果和整个器件性能。研究发现，苯基三甲基碘化铵（PTAI）及其相应的LD钙钛矿表现出优异的热稳定性。进一步研究表明，基于PTAI的LD钙钛矿主要分布在晶界处，这不仅增强了CsPbI的相稳定性，还有效地抑制了非辐射复合。因此，基于CsPbI的冠军PSC器件表现出21.0%的创纪录效率和高稳定性。
