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- W3208221314 abstract "Recent progress in perovskite photovoltaics has witnessed a growing interest in formamidinium lead iodide (FAPbI3), primarily due to its high efficiency potential and excellent stability. However, the high energy barrier of δ-to-α phase transition presents a major hurdle to fabricate phase-pure α-FAPbI3 layers. Here, we report a two-step phase transition process to deposit high-quality photovoltaic α-FAPbI3 films by printing method. This is realized by judicious selection of a Lewis base N-methyl-2-pyrrolidone (NMP) and its counter Lewis acid, which enables the regulation of intermediary phase to reduce the energy barrier. With fine tuning the phase transition pathway, phase-pure and stable α-FAPbI3 perovskite films are obtained, which yield solar devices with a champion efficiency of 21.35%. The printed mini-modules with active areas of 12.32 cm2 and 55.44 cm2 are also fabricated, giving efficiencies of 17.07% and 14.17%, respectively. This work provides new insights of α-FAPbI3 crystallization for constructing efficient and stable printed photovoltaic devices." @default.
- W3208221314 created "2021-11-08" @default.
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- W3208221314 date "2022-01-01" @default.
- W3208221314 modified "2023-10-17" @default.
- W3208221314 title "Reducing energy barrier of δ-to-α phase transition for printed formamidinium lead iodide photovoltaic devices" @default.
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- W3208221314 doi "https://doi.org/10.1016/j.nanoen.2021.106658" @default.
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