High-Performance and Stable Mesoporous Perovskite Solar Cells via Well-Crystallized FA0.85MA0.15Pb(I0.8Br0.2)3

Minhuan Wang; Xiaoqing Jiang; Jiming Bian; Yulin Feng; Chen Wang; Yang Huang; Yadong Zhang; Yantao Shi

doi:10.1021/acsami.8b17833

High-Performance and Stable Mesoporous Perovskite Solar Cells via Well-Crystallized FA_0.85MA_0.15Pb(I_0.8Br_0.2)₃

ACS Appl Mater Interfaces. 2019 Jan 23;11(3):2989-2996. doi: 10.1021/acsami.8b17833. Epub 2019 Jan 9.

Authors

Minhuan Wang¹, Xiaoqing Jiang, Jiming Bian, Yulin Feng, Chen Wang, Yang Huang, Yadong Zhang, Yantao Shi

Affiliation

¹ Department of Materials Science and Engineering , University of California, Los Angeles , Los Angeles , California 90095 , United States.

PMID: 30585718
DOI: 10.1021/acsami.8b17833

Abstract

The overall performance of perovskite solar cells (PSCs) depends particularly on the chemical composition and crystalline quality of the perovskite light harvester. Here, the well-crystallized mixed-cation lead mixed-halide perovskite films with the optimized composition of FA_0.85MA_0.15Pb(I_0.8Br_0.2)₃ were achieved by antisolvent-assisted single-step spin-coating in ambient conditions. The resulting PSCs with the well-crystallized FA_0.85MA_0.15Pb(I_0.8Br_0.2)₃ exhibit impressive power conversion efficiency (PCE) over 20% under standard AM 1.5 illumination with excellent reproducibility. Remarkably, no perceivable degradation in PCE was detected from the PSCs stored in ambient conditions without any encapsulation after 7000 h (nearly 300 days), which was among the best shelf stability ever reported for PSCs. The superior performance was mainly attributed to the improved structural quality of the FA_0.85MA_0.15Pb(I_0.8Br_0.2)₃ layer with reduced grain boundaries, reduced trap-state density, and prolonged carrier lifetime, as well as the better intrinsic stability of the mixed perovskite with an optimized composition.

Keywords: antisolvent spin-coating; grain boundaries; metal halide perovskite; solar cells; stability.