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- W4221090424 abstract "Abstract Lead‐free Cs 2 AgBiBr 6 double perovskite has received widespread attention because of its non‐toxicity and high thermal stability. However, intrinsic bromide ion (Br – ) migration limits continuous operation of Cs 2 AgBiBr 6 ‐based perovskite solar cells (PSCs). Herein, an operational and simple strategy is carried out to improve the power conversion efficiency (PCE) and long‐term stability of Cs 2 AgBiBr 6 ‐based PSCs by introducing 1‐butyl‐1‐methylpyrrolidinium chloride (BMPyrCl) and 1‐butyl‐3‐methylpyridinium chloride (BMPyCl) ionic liquids (ILs). The higher binding energy between Br – in Cs 2 AgBiBr 6 and cation in IL containing pyrrole can inhibit Br – migration effectively, thereby reducing film defects and improving energy level matching. The optimized PCE of 2.22% is obtained for hole transport layer‐free, carbon‐based PSC, which hardly degrades at 40% ± 5% relative humidity and 25 °C for 40 days. This work highlights an effective method to mitigate the halide migration in Cs 2 AgBiBr 6 perovskite, thus providing an effective route in promoting the development of lead‐free double PSCs." @default.
- W4221090424 created "2022-04-03" @default.
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- W4221090424 date "2022-03-20" @default.
- W4221090424 modified "2023-10-17" @default.
- W4221090424 title "Pinning Bromide Ion with Ionic Liquid in Lead‐Free Cs<sub>2</sub>AgBiBr<sub>6</sub> Double Perovskite Solar Cells" @default.
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- W4221090424 doi "https://doi.org/10.1002/adfm.202112991" @default.
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