The role of ion migration, octahedral tilt, and the A-site cation on the instability of Cs_1-xFA_xPbI₃.

ABSTRACT: Organic-inorganic hybrid perovskites are promising materials for the next generation photovoltaics and optoelectronics; however, their practical application has been hindered by poor structural stability mainly caused by ion migration and external stimuli. Understanding the mechanism(s) of ion migration and structure decomposition is thus critical. Here we observe the sequence of structural changes at the atomic level that precede structural decomposition in the technologically important Cs_1-xFA_xPbI₃ using ultralow dose transmission electron microscopy. We find that these changes differ, depending upon the A-site composition. Initially, there is a random loss of FA⁺, complemented by the loss of I^-. The remaining FA⁺ and I

SUBMITTER: Li W 

PROVIDER: S-EPMC10739958 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature