The colloidal synthesis of a new type of lead‐free halide quadruple‐perovskite nanocrystals (NCs) is reported. The photoluminescence quantum yield and charge‐carrier lifetime of quadruple‐perovskite NCs can be enhanced by 96 and 77‐fold, respectively, via metal alloying. Study of charge‐carrier dynamics provide solid demonstrate that the PL enhancement is due to the elimination of ultrafast (1.4 ps) charge‐carrier trapping processes in the alloyed NCs. Thanks to the high crystallinity, low trap‐state density, and long carrier lifetime (193.4 μs), the alloyed quadruple‐perovskite NCs can serve as the active material for high‐performance photodetectors, which exhibit high responsivity (up to 0.98 × 10⁴ A W⁻¹) and an external quantum efficiency (EQE) of 3 × 10⁶%. These numbers are among the highest for perovskite‐NC‐based photodetectors.

中文翻译：

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通过陷阱工程设计的高效发光卤化物四重钙钛矿纳米晶体，用于高灵敏度光电探测器

据报道，新型无铅卤化物四方钙钛矿纳米晶体（NCs）的胶体合成。通过金属合金化，四钙钛矿型NC的光致发光量子产率和电荷载流子寿命分别可以提高96倍和77倍。对载流子动力学的研究提供了坚实的证据，表明PL增强是由于消除了合金NC中超快（1.4 ps）的载流子俘获过程。由于具有高结晶度，低陷阱态密度和长载流子寿命（193.4μs），合金化四方钙钛矿NC可以用作高性能光电探测器的活性材料，该探测器具有高响应度（高达0.98×10 ^4） AW ^-1）和3×10 ⁶的外部量子效率（EQE）％。对于基于钙钛矿NC的光电探测器，这些数字是最高的。