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• W3125356051 endingPage "1103" @default.
• W3125356051 startingPage "1098" @default.
• W3125356051 abstract "Ge doping has been regarded as an effective way to explore the low-toxicity inorganic halide perovskite. However, Ge2+ ions are easy to oxidize because the Ge dopant raises the valence band maximum (VBM) over the water oxidization (H2O/O2) potential. Here we find that surface Cu doping can bend down the band levels and decline the VBM of the CsPb1–xGexBr3 surface below the H2O/O2 potential, then prevent the Ge2+ from being oxidized into Ge4+ by water because the Cu dopant reduces the perovskite surface electron accumulation. Note that the Cu dopant prefers to locate at the perovskite surface rather than the interior, and it reduces the surface energy and enhances the stability. Consequently, the largest Pb reduction increases to 97.3% for the Cu-doped CsPb1–xGexBr3 surface. Moreover, the exciton binding energy and optical absorption of CsPb1–xGexBr3 could be further improved by the surface Cu dopant. This work provides guidance for finding low-toxicity stable inorganic perovskites." @default.
• W3125356051 created "2021-02-01" @default.
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• W3125356051 date "2021-01-20" @default.
• W3125356051 modified "2023-09-23" @default.
• W3125356051 title "97.3% Pb-Reduced CsPb_1–<i>x</i>Ge_<i>x</i>Br₃ Perovskite with Enhanced Phase Stability and Photovoltaic Performance through Surface Cu Doping" @default.
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• W3125356051 doi "https://doi.org/10.1021/acs.jpclett.0c03580" @default.
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