Efficient Luminescent Halide Quadruple-Perovskite Nanocrystals via Trap-Engineering for Highly Sensitive Photodetectors

被引：60

作者：

Bai, Tianxin ^{[1
,2
]}

Yang, Bin ^{[2
,3
]}

Chen, Junsheng ^{[2
]}

Zheng, Daoyuan ^{[1
]}

Tang, Zhe ^{[1
,2
]}

Wang, Xiaochen ^{[1
,2
]}

Zhao, Yang ^{[4
]}

Lu, Ruifeng ^{[5
]}

Han, Keli ^{[1
,2
,3
]}

机构：

[1] Shandong Univ, Inst Mol Sci & Engn, Qingdao 266237, Peoples R China

[2] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100039, Peoples R China

[4] Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy DNL, Dalian 116023, Peoples R China

[5] Nanjing Univ Sci & Technol, Dept Appl Phys, Nanjing 210094, Peoples R China

来源：

ADVANCED MATERIALS | 2021年 / 33卷 / 08期

基金：

中国国家自然科学基金;

关键词：

quadruple perovskite; nanocrystals; photoluminescence; metal alloying; vacancy-ordered structures;

D O I：

10.1002/adma.202007215

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 mu s), the alloyed quadruple-perovskite NCs can serve as the active material for high-performance photodetectors, which exhibit high responsivity (up to 0.98 x 10(4) A W-1) and an external quantum efficiency (EQE) of 3 x 10(6)%. These numbers are among the highest for perovskite-NC-based photodetectors.

引用

页数：9

共 45 条

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