Adjusting energy level alignment between HTL and CsPbI2Br to improve solar cell efficiency

• 作者: Zihan Zhang Jia Li Zhimin Fang Haipeng Xie Yongbo Yuan Chuantian Zuo Liming Ding Bin Yang
• 来源期刊: 半导体学报（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: SHORT COMMUNICATION
• 页码范围: 13-15
• 页数: 3页
• 语种: 英文
• DOI: 10.1088/1674-4926/42/3/030501

摘要

Lead halide perovskites are at the forefront of optoelectronic materials due to their high absorption coefficient, tunable bandgap, long carrier diffusion length, and small exciton binding energy[1-3], yielding high-performance optoelectronic devices.The power conversion efficiency(PCE) of organicinorganic hybrid perovskite solar cells has exceeded 25％[4].But the organic-inorganic hybrid perovskites present low thermal stability.All-inorganic perovskites (CsPbX3, X =I, Br,CI) prepared by replacing the organic ions (MA+, FA+) with inorganic Cs+ show better thermal stability[5].But the photoactive phase α-CsPbl3 is easy to change to the non-photoactive phase (δ-CsPbI3) at room temperature[6, 7].The bromide-containing inorganic perovskite CsPbI2Br is becoming popular due to better phase stability[8-10].