Degradation mechanism of hybrid tin-based perovskite solar cells and the critical role of tin (IV) iodide.

ABSTRACT: Tin perovskites have emerged as promising alternatives to toxic lead perovskites in next-generation photovoltaics, but their poor environmental stability remains an obstacle towards more competitive performances. Therefore, a full understanding of their decomposition processes is needed to address these stability issues. Herein, we elucidate the degradation mechanism of 2D/3D tin perovskite films based on (PEA)_0.2(FA)_0.8SnI₃ (where PEA is phenylethylammonium and FA is formamidinium). We show that SnI₄, a product of the oxygen-induced degradation of tin perovskite, quickly evolves into iodine via the combined action of moisture and oxygen. We identify iodine as a highly aggressive species that can further oxidise the perovskite to more SnI_4</

SUBMITTER: Lanzetta L 

PROVIDER: S-EPMC8121806 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature