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- W3111036132 abstract "Two-dimensional (2D) perovskites with excellent stability and optoelectronic properties have aroused great interest for use in perovskite solar cells (PSCs). To date, the power conversion efficiencies (PCEs) of state-of-the art 2D-PSCs are non-satisfactory because of higher recombination losses in 2D quantum wells. Here, based on a series of alkylic ammonium spacers (ethylamine to hexylamine) with different chain lengths, we present a strategy via the molecular van der Waals interaction to realize modified crystallization, phase distribution, and quantum-confined behaviors in Ruddlesden-Popper 2D perovskites (n = 4). With the optimal amylamine (AA) spacer, high-quality 2D perovskites featuring well-aligned phase alignments with fewer unfavorable n-value species and a reduced exciton binding energy have been realized, leading to sufficient charge transfers through different n-value components. The devices based on (AA)2MA3Pb4I13 yield a champion PCE of 18.42%, showing an impressive open-circuit voltage of 1.25 V and a fill factor exceeding 0.80." @default.
- W3111036132 created "2020-12-21" @default.
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- W3111036132 date "2021-02-01" @default.
- W3111036132 modified "2023-10-17" @default.
- W3111036132 title "Molecular Engineering for Two-Dimensional Perovskites with Photovoltaic Efficiency Exceeding 18%" @default.
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- W3111036132 doi "https://doi.org/10.1016/j.matt.2020.11.011" @default.
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