Modulation of Electron Transport Layers To Minimize Voltage Loss in CsSnI 3 Perovskite Solar Cells

作者：Haixuan Yu, Lijuan Fu, Tianyu Sun, Deyu Wang, Zhirong Liu, Junyi Huang, Zhiguo Zhang, Xiaoting Ma, Xiongjie Li, Bo Hu, Muqing Chen, Shangfeng Yang, Yan Shen, Mingkui Wang · 发表于：ACS Energy Letters · 年份：2025 · DOI：10.1021/acsenergylett.5c01128 · 被引用次数：12 · 研究领域：Perovskite Materials and Applications、Chalcogenide Semiconductor Thin Films、Conducting polymers and applications

The efficiency of tin-based perovskite solar cells, particularly the inorganic CsSnI 3, remains far below that of lead-based counterparts due to the substantial voltage loss at the charge transport layer-perovskite interface. Systematic research shows that the voltage loss in the CsSnI 3 perovskite planar solar cells is mainly due to the reduction in the splitting of the quasi-Fermi energy level and the increase in the energy band bending at the electron transport layer (ETL)-perovskite interface. In this study, we propose the fullerene derivative tetramethylcyclobutadiene-C 60 (TMCB), which has the high lowest unoccupied molecular orbital energy level, as an ETL for CsSnI 3 perovskite planar solar cells to minimize voltage losses. The TMCB ETL has been demonstrated to facilitate CsSnI 3 -based perovskite solar cells to achieve a remarkable power conversion efficiency of 14.95% with a high open circuit voltage of 0.81 V measured under AM 1.5G irradiation.