通过陷阱工程制备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。
Efficient Luminescent Halide Quadruple-Perovskite Nanocrystals via Trap-Engineering for Highly Sensitive Photodetectors.
作者信息
Bai Tianxin, Yang Bin, Chen Junsheng, Zheng Daoyuan, Tang Zhe, Wang Xiaochen, Zhao Yang, Lu Ruifeng, Han Keli
机构信息
Institute of Molecular Sciences and Engineering, Shandong University, Qingdao, 266237, P. R. China.
State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, 116023, P. R. China.
出版信息
Adv Mater. 2021 Feb;33(8):e2007215. doi: 10.1002/adma.202007215. Epub 2021 Jan 20.
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 × 10 A W ) and an external quantum efficiency (EQE) of 3 × 10 %. These numbers are among the highest for perovskite-NC-based photodetectors.
报道了一种新型无铅卤化物四重钙钛矿纳米晶体（NCs）的胶体合成方法。通过金属合金化，四重钙钛矿NCs的光致发光量子产率和电荷载流子寿命可分别提高96倍和77倍。对电荷载流子动力学的研究有力地证明了PL增强是由于合金化NCs中超快（1.4 ps）电荷载流子俘获过程的消除。由于具有高结晶度、低陷阱态密度和长载流子寿命（193.4 μs），合金化四重钙钛矿NCs可作为高性能光电探测器的活性材料，其表现出高响应度（高达0.98×10 A/W）和3×10%的外量子效率（EQE）。这些数值在基于钙钛矿-NC的光电探测器中是最高的之一。
Zotero 插件