Publication date: 17th February 2025
Halide perovskites are at the center of numerous research and development efforts due to their optimal light harvesting properties, which can be tuned across the visible spectral range, particularly by mixing halides. However, mixed halide perovskites are unstable under illumination, as halide segregation leads to the formation of a two-bandgap region, [1] ultimately degrading solar cell performance. The underlying mechanism remains a subject of debate in the literature,[2] with one hypothesis suggesting that polarons play a role by inducing strain-driven phase separation at their formation sites. Polarons are photogenerated charge carriers accompanied by lattice distortions.
This talk focuses on investigating halide segregation to gain a better understanding of its mechanism through in situ illumination in an aberration-corrected TEM. We will report our observations of atomic-scale changes in pure bromide, CsPbBr3, and mixed inorganic perovskites, CsPb(IxBr1-x)3 thin films and nanocubes under in-situ illumination with nanosecond time resolution. These effects include strain, halide phase separation and photoreduction to form lead clusters. We report on the effects of wavelength, intensity and photon dose on the photo-induced behavior. A particular emphasis is placed on the sample preparation to enhance the resolution of this nanoscale analysis. Finally, with this study, we aim to gain insights into the possible atomistic mechanisms underlying halide phase segregation.
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