Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)
Publication date: 22nd May 2020
One of the main bottlenecks for the commercialization of lead-halide perovskites (LHP) is their instability against external stimuli and in particular against illumination. In this respect a material that epitomizes such instability are mixed-halide perovskites (mLHP).Upon illumination mLHP undergo structural changes leading to the formation of I-rich regions negatively affecting the performance of photovoltaic devices and LEDs based on these materials.
Herein we show that the conspicuous photoinduced phase segregation characteristic of these materials is primarily the result of the local and metastable rearrangement of the iodide sublattice. A local photophysical study comprising spectrally-resolved laser scanning confocal microscopy is employed to find a correlation between defect density and the dynamics of photo-induced changes, which extend far from the illuminated region. We observe that iodide rich regions evolve much faster from highly defective regions. Also, by altering the material composition, we find evidence for the interplay between iodide-related defect distribution and the intra and inter domain migration dynamics giving rise to the complexity of this process.
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