Fluorine ion induced phase evolution of tin-based perovskite thin films: structure and properties.

ABSTRACT: To study the effect of fluorine ions on the phase transformation of a tin-based perovskite, CsSnI_3-x (F) _x films were deposited by using thermal vacuum evaporation from a mixed powder of SnI₂, SnF₂ and CsI, followed by rapid vacuum annealing. The color evolution, structure, and properties of CsSnI_3-x F _x films aged in air were observed and analyzed. The results showed that the colors of the films changed from black to yellow, and finally presented as black again over time; the unstable B-γ-CsSnI_3-x F _x phase transformed into the Y-CsSnI_3-x F _x phase, which is then recombined into the Cs₂SnI_6-x F

SUBMITTER: Wu J 

PROVIDER: S-EPMC9075532 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature