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- W4306643531 abstract "A band-mapping technique is introduced to investigate the formation of low-energy edge states in quasi-2D Ruddlesden-Popper (RP) perovskites, (BA)2(MA)n-1PbnI3n+1, through a localized mode of measurement, namely, scanning tunneling spectroscopy. The local band structures measured at different points reveal the formation of 3D CH3NH3PbI3 (MAPbI3) at the edges of the perovskite nanosheets; for thin films, the 3D phase (n = ∞) could be seen to form at grain boundaries. The presence of MAPbI3 at the edges or grain boundaries of the perovskites has led to self-forming type-II band alignment in BA2MA2Pb3I10 (n = 3). The rationale behind achieving a high-efficiency solar cell based on the material, which has a large exciton binding energy, has been inferred. Kelvin probe force microscopy studies under illumination have yielded a higher surface photovoltage at the edges compared to the interior and supported the inference of exciton dissociation due to internal type-II band alignment in the quasi-2D RP perovskites." @default.
- W4306643531 created "2022-10-18" @default.
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- W4306643531 date "2022-10-17" @default.
- W4306643531 modified "2023-09-23" @default.
- W4306643531 title "Quasi-2D Ruddlesden–Popper Lead Halide Perovskites: How Edge Matters" @default.
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- W4306643531 doi "https://doi.org/10.1021/acs.jpclett.2c02739" @default.
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