Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
Mixed-halide perovskites have nowadays shown their potential for a variety of optoelectronic devices. But photoinduced structural changes, characteristic of this type of material, lead to extreme photophysical changes that are currently the subject of intense debate. In this work we show that photoinduced phase segregation, characteristic of these materials, is due to a local and metastable rearrangement of the iodide sublattice. A local photophysical study employing spectrally resolved laser scanning confocal microscopy shows a correlation between the defect density and the dynamics of photoinduced changes, the latter extending far from the illuminated region. We observe how iodide-rich regions evolve much faster from highly defective regions. Also, by altering the material composition, we find evidence for the interplay between the iodide-related defect distribution and the intra- and interdomain migration dynamics giving rise to the complexity of this process.
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