Efficient α-CsPbI3 Photovoltaics with Surface Terminated Organic Cations

By Yong Wang, Taiyang Zhang, Miao Kan, Yihui Li, Tian Wang, Yixin Zhao. Joule, 2018

291 citations recorded by the source corpus.

Summary Quasi-2D or 2D capping is an effective strategy to stabilize organic-inorganic metal halide perovskite materials, often at a detriment to electronic transport. Due to an efficient cation exchange between organic constituents, the location and thickness of reduced-dimensional hybrid perovskite layers is difficult to control. We find that the all-inorganic CsPbI3 perovskite cannot go through either solid state or sequential cation exchange to form a 2D perovskite capping layer. Instead, a defect-passivating organic cation terminated surface is formed that improves phase stability and moisture resistance. The corresponding α-CsPbI3 perovskite solar cells exhibit high reproducibility with a champion stabilized efficiency of 13.5%. This work shows that the high cation exchange resistance of CsPbI3 perovskites can be exploited to promote the development of highly efficient and stable perovskite photovoltaics.

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/a870e559ec8368eabca547608a24400d89941c6a