Surface Iodide Defects Control the Kinetics of the CsPbI₃ Perovskite Phase Transformation.

ABSTRACT: Halide perovskites are technologically interesting across a wide range of optoelectronic devices, especially photovoltaics, but material stability has proven to be challenging. One degradation mode of note is the meta stability of the perovskite phase of some material compositions. This was studied by tracking the change of CsPbI₃ from its optoelectronically relevant perovskite phase to its thermodynamically stable nonperovskite phase, δ-CsPbI₃. We explore kinetics as a function of surface chemistry and observe a quantitatively similar, ∼5-fold, reduction in the phase transition rate between neat films and those treated with CsI and CdI₂. Using XPS to explore surface chemistry changes across samples, we link the reduction in the phase transition rate to the

SUBMITTER: Wylie ZR 

PROVIDER: S-EPMC11406572 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature