Two-dimensional transition metal dichalcogenides for lead halide perovskites-based photodetectors: band alignment investigation for the case of CsPbBr3/MoSe2

Le Huang; Nengjie Huo; Zhaoqiang Zheng; Huafeng Dong; Jingbo Li

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Two-dimensional transition metal dichalcogenides for lead halide perovskites-based photodetectors: band alignment investigation for the case of CsPbBr3/MoSe2

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The distinguished electronic and optical properties of lead halide perovskites(LHPs)make them good candidates for active layer in optoelectronic devices.Integrating LHPs and two-dimensional(2 D)transition metal dichalcogenides(TMDs)provides opportunities for achieving increased performance in heterostructured LHPs/TMDs based optoelectronic devices.The electronic structures of LHPs/TMDs heterostructures,such as the band offsets and interfacial interaction,are of fundamental and technological interest.Here CsPbBr3 and MoSe2 are taken as prototypes of LHPs and 2 D TMDs to investigate the band alignment and interfacial coupling between them.Our GGA-PBE and HSE06 calculations reveal an intrinsic type-II band alignment between CsPbBr3 and MoSe2.This type-II band alignment suggests that the performance of CsPbBr3-based photodetectors can be improved by incorporating MoSe2 monolayer.Furthermore,the absence of deep defect states at CsPbBr3/MoSe2 interfaces is also beneficial to the better performance of photodetectors based on CsPbBr3/MoSe2 heterostructure.This work not only offers insights into the improved performance of photodetectors based on LHPs/TMDs heterostructures but it also provides guidelines for designing high-efficiency optoelectronic devices based on LHPs/TMDs heterostructures.

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来源
《半导体学报》 |2020年第5期|99-104|共6页
作者
Le Huang; Nengjie Huo; Zhaoqiang Zheng; Huafeng Dong; Jingbo Li;
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作者单位

School of Materials and Energy;

Guangdong University of Technology;

Guangzhou 510006;

China;

Institute of Semiconductor Science and Technology;

South China Normal University;

Guangzhou 510631;

China;

School of Physics and Optoelectronic Engineering;

Guangdong University of Technology;

Guangzhou 510006;

China;

State Key Laboratory of Superlattices and Microstructures;

Institute of Semiconductors;

Chinese Academy of Sciences;

Beijing 100083;

China;

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原文格式 PDF
正文语种 chi
中图分类光电器件、光电管;功能材料;
关键词
lead; halide; perovskites; transition; metal; dichalcogenides; photodetectors; band; alignment; interfacial; coupling;

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Two-dimensional transition metal dichalcogenides for lead halide perovskites-based photodetectors: band alignment investigation for the case of CsPbBr3/MoSe2

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