Control over Crystal Size in Vapor Deposited Metal-Halide Perovskite Films.

ABSTRACT: Understanding and controlling grain growth in metal halide perovskite polycrystalline thin films is an important step in improving the performance of perovskite solar cells. We demonstrate accurate control of crystallite size in CH₃NH₃PbI₃ thin films by regulating substrate temperature during vacuum co-deposition of inorganic (PbI₂) and organic (CH₃NH₃I) precursors. Films co-deposited onto a cold (-2 °C) substrate exhibited large, micrometer-sized crystal grains, while films that formed at room temperature (23 °C) only produced grains of 100 nm extent. We isolated the effects of substrate temperature on crystal growth by developing a new method to control sublimation of the organic precursor, and CH₃NH₃

SUBMITTER: Lohmann KB 

PROVIDER: S-EPMC7147257 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature