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- W3126471046 abstract "In recent years, there has been a surge in research efforts to utilize organic−inorganic lead halide perovskites (OLHPs) in optoelectronic devices (e.g., concentrator photovoltaics) requiring high light illumination. Yet, knowledge of the physics of photocarriers in perovskites in the high-excitation regime is limited. Here, we investigate carrier and exciton dynamics that are manifested under strong light illumination in methyl ammonium lead bromide perovskite nanocrystals (NCs) using ultrafast pump-probe spectroscopy. We demonstrate that the carrier trapping process is highly excitation intensity dependent because of a potential barrier that isolates trap states from the band edge. At low excitation densities, holes are unable to cross the energy barrier, but holes undergo trapping at moderate densities (1018–1020 cm–3). The charge carrier trapping is negligible due to the dominance of higher-order Auger processes at high excitation density (>1020 cm–3). We suggest that the effect of trap states is likely to be insignificant for perovskite concentrator solar cells." @default.
- W3126471046 created "2021-02-15" @default.
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- W3126471046 date "2021-02-01" @default.
- W3126471046 modified "2023-10-10" @default.
- W3126471046 title "Ultrafast Many-Particle Phenomena in Lead Bromide Hybrid Perovskite Nanocrystals Under Strong Optical Excitation" @default.
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- W3126471046 doi "https://doi.org/10.1021/acs.jpcc.0c10140" @default.
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