Tunable Performance of Quantum Dot-MoS2 Hybrid Photodetectors via Interface Engineering

被引：14

作者：

Chang, Ruiheng ^{[1
,2
]}

Wang, Kexin ^{[1
,2
]}

Zhang, Youwei ^{[1
,2
]}

Ma, Tianzi ^{[3
,4
]}

Tang, Jianwei ^{[3
,4
]}

Chen, Xue-Wen ^{[3
,4
]}

Zhang, Butian ^{[1
,2
]}

Wang, Shun ^{[1
,2
]}

机构：

[1] Huazhong Univ Sci & Technol, MOE Key Lab Fundamental Phys Quant Measurement, Wuhan 430074, Peoples R China

[2] Huazhong Univ Sci & Technol, PGMF, Hubei Key Lab Gravitat & Quantum Phys, Wuhan 430074, Peoples R China

[3] Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Peoples R China

[4] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Wuhan 430074, Peoples R China

来源：

ACS APPLIED MATERIALS & INTERFACES | 2021年 / 13卷 / 49期

基金：

中国国家自然科学基金;

关键词：

hybrid photodetector; tunable performance; interface engineering; band alignments; MoS2; quantum dots; ENERGY-TRANSFER; 2-DIMENSIONAL MATERIALS; CHARGE SEPARATION; ELECTRON-TRANSFER; DOTS; GRAPHENE; RECOMBINATION; PHOTOTRANSISTORS; RATES; MOS2;

D O I：

10.1021/acsami.1c10888

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Heterostructures of quantum dots (QDs) and two-dimensional (2D) materials show promising potential for photodetection applications owing to their combination of high optical absorption and good in-plane carrier mobility. In this work, the performance of QD-2D photodetectors is tuned by band engineering. Devices are fabricated by coating MoS2 nanosheets with InP QDs, type-I core-shell InP/ZnS QDs, and type-II core-shell InP/CdS QDs. Comparative spectroscopic and photoelectric studies of different hybrids show that the energy band 2 alignment and shell thickness can influence the efficiency of charge transfer (CT), energy transfer (ET), and defect-related processes between QDs and MoS2. Benefiting from efficient CT between the QDs and MoS2, a significant enhancement of responsivity and detectivity is observed in thick-shell InP/CdS QD-MoS2 devices. Our results demonstrate the feasibility of using core-shell QDs for regulating the ET and CT efficiency in heterostructures and highlight the importance of interface band design in QD-2D and other low-dimensional photodetectors.

引用

页码：59411 / 59421

页数：11

共 67 条

[1] Charge-transfer and energy-transfer processes in π-conjugated oligomers and polymers:: A molecular picture [J].