High-Performance Photodiode Based on Atomically Thin WSe2 /MoS2 Nanoscroll Integration

Wenjie Deng; Congya You; Xiaoqing Chen; Yi Wang; Yufo Li; Beibei Feng; Ke Shi; Yongfeng Chen; Ling Sun; Yongzhe Zhang

doi:10.1002/smll.201901544

High-Performance Photodiode Based on Atomically Thin WSe₂ /MoS₂ Nanoscroll Integration

Small. 2019 Jul;15(30):e1901544. doi: 10.1002/smll.201901544. Epub 2019 May 23.

Authors

Wenjie Deng^{1

2}, Congya You^{1

2}, Xiaoqing Chen^{1

2}, Yi Wang^{1

2}, Yufo Li^{1

2}, Beibei Feng^{1

2}, Ke Shi^{1

2}, Yongfeng Chen^{1

2}, Ling Sun³, Yongzhe Zhang^{1

2}

Affiliations

¹ College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China.
² The Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing, 100124, China.
³ Beijing Guyue New Materials Research Institute, Beijing University of Technology, Beijing, 100124, China.

PMID: 31119889
DOI: 10.1002/smll.201901544

Abstract

Self-assembled structures of 2D materials with novel physical and chemical properties, such as the good electrical and optoelectrical performance in nanoscrolls, have attracted a lot of attention. However, high photoresponse speed as well as high responsivity cannot be achieved simultaneously in the nanoscrolls. Here, a photodiode consisting of single MoS₂ nanoscrolls and a p-type WSe₂ is demonstrated and shows excellent photovoltaic characteristics with a large open-circuit voltage of 0.18 V and high current intensity. Benefiting from the heterostructure, the dark current is suppressed resulting in an increased ratio of photocurrent to dark current (two orders of magnitude higher than the single MoS₂ nanoscroll device). Furthermore, it yields high responsivity of 0.3 A W^-1 (corresponding high external quantum efficiency of ≈75%) and fast response time of 5 ms, simultaneously. The response speed is increased by three orders of magnitude over the single MoS₂ nanoscroll device. In addition, broadband photoresponse up to near-infrared could be achieved. This atomically thin WSe₂ /MoS₂ nanoscroll integration not only overcomes the disadvantage of MoS₂ nanoscrolls, but also demonstrates a single nanoscroll-based heterostructure with high performance, promising its potential in the future optoelectronic applications.

Keywords: 2D materials; heterostructures; high performance; nanoscrolls; photodiodes.

Abstract

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