Enhanced performance of ZnO nanoparticle decorated all-inorganic CsPbBr3 quantum dot photodetectors

Kai Shen; Xiao Li; Hao Xu; Mingqing Wang; Xiao Dai; Jian Guo; Ting Zhang; Shibin Li; Guifu Zou; Kwang-Leong Choy; Ivan P. Parkin; Zhengxiao Guo; Huiyun Liu; Jiang Wu

doi:10.1039/C9TA00230H

Enhanced performance of ZnO nanoparticle decorated all-inorganic CsPbBr₃ quantum dot photodetectors†

Kai Shen,

^a Xiao Li,

^a Hao Xu,

*^a Mingqing Wang,

^b Xiao Dai,^c Jian Guo,

^d Ting Zhang,^e Shibin Li,

^e Guifu Zou,

^c Kwang-Leong Choy,*^b Ivan P. Parkin,

^d Zhengxiao Guo,

^dfg Huiyun Liu^a and Jiang Wu

*^ah

Author affiliations

* Corresponding authors

^a Department of Electronic and Electrical Engineering, University College London, Torrington Place, London WC1E 7JE, UK
E-mail: hao.xu.15@ucl.ac.uk, jiangwu@uestc.edu.cn

^b Institute for Materials Discovery, University College London, Torrington Place, London WC1E 7JE, UK
E-mail: k.choy@ucl.ac.uk

^c School of Energy, Soochow Institute for Energy and Materials Innovations, Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou 215006, China

^d Department of Chemistry, University College London, 20 Gordon Street, Bloomsbury, London WC1H 0AJ, UK

^e State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu, Sichuan, China

^f Departments of Chemistry and Mechanical Engineering, The University of Hong Kong, Hong Kong SAR, China

^g Zhejiang Institute of Research and Innovation, The University of Hong Kong, Qingshan Lake SciTech City, Hangzhou, China

^h Institute of Fundamental and Frontier Science, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China

Abstract

All-inorganic perovskite quantum dots have attracted substantial attention due to their excellent optical properties. However, the surface states of colloidal quantum dots and the insufficient carrier transport in a quantum dot film hinder their further development. Here, solution-processed CsPbBr₃/ZnO quantum dot/nanoparticle nanocomposites are used to lessen the impact of surface states as well as facilitate charge transport. The blending of ZnO nanoparticles during CsPbBr₃ quantum dot synthesis results in improved optical properties as well as film formation that enhances charge transport. A photodetector based on the CsPbBr₃/ZnO/glassy-graphene heterostructure is fabricated, which exhibits an enhanced photoresponse and distinct self-powered operation with an open-circuit voltage as large as 150 mV. Most importantly, an excellent stability of the hybrid nanoparticle/quantum dot photodetector is reported and consistent high performance with marginal degradation is achieved for more than 7 months.

Journal of Materials Chemistry A

Enhanced performance of ZnO nanoparticle decorated all-inorganic CsPbBr₃ quantum dot photodetectors†

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Enhanced performance of ZnO nanoparticle decorated all-inorganic CsPbBr₃ quantum dot photodetectors

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Journal of Materials Chemistry A