材料科学
钙钛矿(结构)
轨道能级差
能量转换效率
掺杂剂
硼烷
光电子学
光伏系统
钙钛矿太阳能电池
纳米技术
化学工程
光伏
兴奋剂
有机化学
催化作用
化学
工程类
生物
分子
生态学
作者
Chong Liu,Yuzhao Yang,Cuiling Zhang,Shaohang Wu,Wei Liu,Fei Guo,Gowri Manohari Arumugam,Jinlong Hu,Xingyuan Liu,Jie Lin,R.E.I. Schropp,Yaohua Mai
标识
DOI:10.1002/adma.201907361
摘要
Although inorganic perovskite solar cells (PSCs) are promising in thermal stability, their large open-circuit voltage (VOC ) deficit and difficulty in large-area preparation still limit their development toward commercialization. The present work tailors C60 via a codoping strategy to construct an efficient electron-transporting layer (ETL), leading to a significant improvement in VOC of the inverted inorganic CsPbI2 Br PSC. Specifically, tris(pentafluorophenyl)borane (TPFPB) is introduced as a dopant to lower the lowest unoccupied molecular orbital (LUMO) level of the C60 layer by forming a Lewis acidic adduct. The enlarged free energy difference provides a favorable enhancement in electron injection and thereby reduces charge recombination. Subsequently, a nonhygroscopic lithium salt (LiClO4 ) is added to increase electron mobility and conductivity of the film, leading to a reduction in the device hysteresis and facilitating the fabrication of a large-area device. Finally, the as-optimized inorganic CsPbI2 Br PSCs gain a champion power conversion efficiency (PCE) of 15.19%, with a stabilized power output (SPO) of 14.21% (0.09 cm2 ). More importantly, this work also demonstrates a record PCE of 14.44% for large-area inorganic CsPbI2 Br PSCs (1.0 cm2 ) and reports the first inorganic perovskite solar module with the excellent efficiency exceeding 12% (10.92 cm2 ) by a self-developed quasi-curved heating method.
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