期刊

Journal of Materials Chemistry C

标题

All-inorganic 0D/3D Cs4Pb(IBr)6/CsPbI3−xBrx mixed-dimensional perovskite solar cells with enhanced efficiency and stability

作者

Zhenzhen Li, Xiaolong Liu, Jia Xu, Shujie Yang, Hang Zhao, Hui Huang, Shengzhong (Frank) Liu and Jianxi Yao

摘要

The inorganic halide perovskite CsPbI3 has shown great promise in efficient solar cells. However, α-phase CsPbI3 is thermodynamically unstable at room temperature, limiting its applications. Herein, we have successfully fabricated highly stable all-inorganic 0D/3D Cs4Pb(IBr)6/CsPbI3−xBrx mixed-dimensional perovskite solar cells. The 0D Cs4Pb(IBr)6 phase spontaneously distributes in the 3D CsPbI3−xBrx perovskite phase and facilitates the (100) preferential crystal orientation of the CsPbI3−xBrx crystals. Due to the reasonable energy level alignment and lattice match between (040) in 0D Cs4Pb(IBr)6 and (002) in 3D CsPbI3−xBrx crystals, a 0D–3D heterojunction structure formed. The defect passivation and non-radiative recombination suppression within the films effectively promote smooth carrier transport in the perovskite solar cells, boosting the efficiency to 14.77%. The devices retained 93.9% of the initial efficiency after 60 days in a nitrogen atmosphere. Moreover, a high efficiency of 10.52% has also been achieved in the 1 cm2-large solar cells due to the high uniformity and repeatability of the 0D/3D films.

原文链接

https://pubs.rsc.org/en/content/articlelanding/2020/tc/d0tc01832e