Zhao Wei, Wu Lin, Chen Jianlin, Ju Jiayao, Zeng Yuxi, Wu Zihan, He Jintao, Huang Jincheng, Peng Zhuoyin, Chen Jian
Key Laboratory of Efficient and Clean Energy Utilization, The Education Department of Hunan Province, School of Energy and Power Engineering, Changsha University of Science and Technology, Changsha, 410114, China.
ChemSusChem. 2024 Aug 26;17(16):e202400223. doi: 10.1002/cssc.202400223. Epub 2024 Apr 15.
In recent years, hole transport layer-free all-inorganic CsPbIBr carbon-electroded perovskite solar cells (C-PSCs) have garnered significant attention due to a trade-off between stability and photovoltaic performance. However, there are inevitably many defects generated at the surfaces or grain boundaries of CsPbIBr perovskite films, which will serve as carrier non-radiative recombination centers, and CsPbIBr perovskite films are sensitive to water molecules to degrade, together with energy level mismatch between CsPbIBr perovskite and carbon electrodes. Herein, 1-benzyl-3-methylimidazolium hexafluorophosphate (1-B-3-MIMPF), an imidazolium-based ionic liquid simultaneously containing benzene ring and fluorine atoms, was introduced for the modification of the perovskite/carbon interface. The results showed that it could effectively reduce defects, enhance carrier transfer, mitigate carrier non-radiative recombination, facilitate energy alignment, and block moisture intrusion. Therefore, the photovoltaic performance of the modified PSCs with ITO/SnO/CsPbIBr/1-B-3-MIMPF/carbon architecture has been boosted with a champion power conversion efficiency (PCE) of 13.47 %, open circuit voltage of 1.20 V, short circuit current density of 14.69 mA/cm, and fill factor of 76 %. Moreover, the unencapsulated modified devices exhibited an improved stability and the PCE maintained 78 % of their initial PCE after 24 h storage at room temperature in a 30 %-35 % humidity environment, whereas that of the pristine devices dropped to almost zero.
近年来，无空穴传输层的全无机CsPbIBr碳电极钙钛矿太阳能电池（C-PSCs）因稳定性与光伏性能之间的权衡而备受关注。然而，CsPbIBr钙钛矿薄膜的表面或晶界不可避免地会产生许多缺陷，这些缺陷将作为载流子非辐射复合中心，并且CsPbIBr钙钛矿薄膜对水分子敏感易降解，同时CsPbIBr钙钛矿与碳电极之间存在能级不匹配问题。在此，引入了1-苄基-3-甲基咪唑六氟磷酸盐（1-B-3-MIMPF），一种同时含有苯环和氟原子的咪唑基离子液体，用于修饰钙钛矿/碳界面。结果表明，它可以有效减少缺陷，增强载流子转移，减轻载流子非辐射复合，促进能量匹配，并阻止水分侵入。因此，具有ITO/SnO/CsPbIBr/1-B-3-MIMPF/碳结构的修饰后PSCs的光伏性能得到了提升，最佳功率转换效率（PCE）为13.47%，开路电压为1.20 V，短路电流密度为14.69 mA/cm，填充因子为76%。此外，未封装的修饰器件表现出更好的稳定性，在30%-35%湿度环境下室温储存24小时后，PCE保持其初始PCE的78%，而原始器件的PCE几乎降至零。
