Passivating {100} Facets of PbS Colloidal Quantum Dots via Perovskite Bridges for Sensitive and Stable Infrared Photodiodes

Duo Chen; Yuxuan Liu; Bing XiaLong ChenYang YangGaoyuan YangJing LiuShuaicheng LuCiyu GePeilin LiuJunrui YangGuijie LiangXinzheng LanXiangbin ZengLuying LiJianbing ZhangZewen XiaoLiang GaoJiang Tang

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Passivating {100} Facets of PbS Colloidal Quantum Dots via Perovskite Bridges for Sensitive and Stable Infrared Photodiodes

机译：Passivating {100} Facets of PbS Colloidal Quantum Dots via Perovskite Bridges for Sensitive and Stable Infrared Photodiodes

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Solution-processed PbS colloidal quantum dots (CQDs) are promising optoelectronic materials for next-generation infrared imagers due to their monolithic integratability with silicon readout circuit and tunable bandgap controlled by CQDs size. However, large-size PbS CQDs (diameter >4 nm) for longer shortwave-infrared photodetection consist mainly of {100} facets with incomplete surface passivation and unsatisfied stability. Here, it is reported that perovskite-bridged PbS CQDs, in which the {100} facets of the CQDs are epitaxially bridged with CsPbI_(3-x)Br_x perovskite, can achieve improved passivation and enhanced stability in comparison with the traditional strategies. The resultant infrared CQDs photodiodes exhibit significantly reduced dark current, nearly 50% enhanced photoresponse, and improved work stability. These superior properties synergistically produce the most balanced performance (with a high ?3 dB bandwidth of 42 kHz and an impressive specific detectivity of 6.2 × 10~(12) Jones) among the reported CQDs photodetectors.

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来源
《Advanced functional materials》 |2023年第1期|2210158.1-2210158.9|共9页
作者
Duo Chen; Yuxuan Liu; Bing XiaLong ChenYang YangGaoyuan YangJing LiuShuaicheng LuCiyu GePeilin LiuJunrui YangGuijie LiangXinzheng LanXiangbin ZengLuying LiJianbing ZhangZewen XiaoLiang GaoJiang Tang;
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Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information Huazhong University of Science and Technology 1037 Luoyu Road, Wuhan 430074, P. R. China;

School of Physics and Electronic Engineering Hubei University of Art and Science 296 Longzhong Road, Xiangyang 441053, P. R. China;

Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information Huazhong University of Science and Technology 1037 Luoyu Road, Wuhan 430074, P. R. China,Optics Valley Laboratory 1037 Luoyu Road, Wuhan 430074, P. R. Ch;

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colloidal quantum dots; perovskite bridge passivation; photodetectors;

Passivating {100} Facets of PbS Colloidal Quantum Dots via Perovskite Bridges for Sensitive and Stable Infrared Photodiodes

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