Microscopic Degradation in Formamidinium-Cesium Lead Iodide Perovskite Solar Cells under Operational Stressors

By Nengxu Li, Yanqi Luo, Zehua Chen, Xiuxiu Niu, X. Zhang, Jiuzhou Lu, Rishi E. Kumar, Junke Jiang, Huifen Liu, Xiao Guo and 6 more. 2020

199 citations recorded by the source corpus.

Summary The most important obstacle to widespread use of perovskite solar cells is their poor stability under operational stressors. Here, we systematically monitor the evolution of the photovoltaic performance of perovskite solar cells based on formamidinium-cesium lead iodide (FA0.9Cs0.1PbI3) for 600 h, under a series of controlled operational stressors. Although these devices exhibit reasonable thermal stability, their stability under illumination or stabilized power output (SPO) is far from commercial demands. Synchrotron-based nanoprobe X-ray fluorescence and X-ray-beam-induced current measurements reveal that current-blocking Cs-rich phases segregate during stress tests. The decrease in performance is in line with the increasing density of the Cs-rich clusters in area upon illumination. Theoretical calculations indicate that light-generated carriers provide the thermodynamic driving force for that phase segregation. Our findings correlate device performance to microscopic behavior and atomistic mechanisms and shed light on inhibiting the cation-dependent phase segregation during device operation.

Subfields: Electrical and Electronic Engineering, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/5ef07d3c5569e6c228271fb514eb73d17f3cbef3

Citations in the corpus

• Homogenizing out-of-plane cation composition in perovskite solar cells (2023, unknown): “However, there are growing concerns about the stability of Cs-containing per-ovskites due to the segregation of the cations, which could potentially accelerate the long-term degradation 3,4,10,11 .”