Tailoring C60 for Efficient Inorganic CsPbI2Br Perovskite Solar Cells and Modules

• DOI: 10.1002/adma.201907361
• Publication Date: 2020-01-15T18:22:05Z
• Authors: Chong Liu; Yuzhao Yang; Cuiling Zhang; Shaohang Wu; Liyu Wei; Fei Guo; Gowri Manohari Ar...; Jinlong Hu; Xingyuan Liu; Jie Lin; Ruud E. I. Schropp; Yaohua Mai
• Keywords: HOMO/LUMO; Perovskite solar cell; Boranes

Although inorganic perovskite solar cells (PSCs) are promising in thermal stability, their large open-circuit voltage (VOC ) deficit and difficulty large-area preparation still limit development toward commercialization. The present work tailors C60 via a codoping strategy to construct an efficient electron-transporting layer (ETL), leading significant improvement VOC of the inverted CsPbI2 Br PSC. Specifically, tris(pentafluorophenyl)borane (TPFPB) is introduced as dopant lower lowest unoccupied molecular orbital (LUMO) level by forming Lewis acidic adduct. enlarged free energy difference provides favorable enhancement electron injection thereby reduces charge recombination. Subsequently, nonhygroscopic lithium salt (LiClO4 added increase mobility conductivity film, reduction device hysteresis facilitating fabrication device. Finally, as-optimized PSCs gain champion power conversion efficiency (PCE) 15.19%, with stabilized output (SPO) 14.21% (0.09 cm2 ). More importantly, this also demonstrates record PCE 14.44% for (1.0 reports first module excellent exceeding 12% (10.92 self-developed quasi-curved heating method.