MA Cation-Induced Diffusional Growth of Low-Bandgap FA-Cs Perovskites Driven by Natural Gradient Annealing.

ABSTRACT: Low-bandgap formamidinium-cesium (FA-Cs) perovskites of FA_1-x Cs _x PbI₃ (x < 0.1) are promising candidates for efficient and robust perovskite solar cells, but their black-phase crystallization is very sensitive to annealing temperature. Unfortunately, the low heat conductivity of the glass substrate builds up a temperature gradient within from bottom to top and makes the initial annealing temperature of the perovskite film lower than the black-phase crystallization point (~150°C). Herein, we take advantage of such temperature gradient for the diffusional growth of high-quality FA-Cs perovskites by introducing a thermally unstable MA⁺ cation, which would firstly form α-phase FA-MA-Cs mixed perovskites with low formatio

SUBMITTER: Zhang T 

PROVIDER: S-EPMC8391048 | biostudies-literature | 2021

REPOSITORIES: biostudies-literature