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Type-II WS2–ReSe2 heterostructure and its charge-transfer properties

Published online by Cambridge University Press:  16 December 2019

Xiuxiu Han ,
Dawei He ,
Lu Zhang ,
Shengcai Hao ,
Shuangyan Liu ,
Jialu Fu ,
Qing Miao ,
Jiaqi He ,
Yongsheng Wang  and
Hui Zhao Open the ORCID record for Hui Zhao [Opens in a new window]
Xiuxiu Han
Affiliation:
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing100044, China
Dawei He
Affiliation:
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing100044, China
Lu Zhang
Affiliation:
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing100044, China
Shengcai Hao
Affiliation:
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing100044, China
Shuangyan Liu
Affiliation:
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing100044, China
Jialu Fu
Affiliation:
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing100044, China
Qing Miao
Affiliation:
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing100044, China
Jiaqi He
Affiliation:
College of Mathematics and Physics, Beijing University of Chemical Technology, Beijing100029, China
Yongsheng Wang*
Affiliation:
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing100044, China
Hui Zhao*
Affiliation:
Department of Physics and Astronomy, The University of Kansas, Lawrence, Kansas66045, USA
*
a)Address all correspondence to these authors. e-mail: yshwang@bjtu.edu.cn
b)e-mail: huizhao@ku.edu
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Abstract

We fabricated a van der Waals heterostructure of WS2–ReSe2 and studied its charge-transfer properties. Monolayers of WS2 and ReSe2 were obtained by mechanical exfoliation and chemical vapor deposition, respectively. The heterostructure sample was fabricated by transferring the WS2 monolayer on top of ReSe2 by a dry transfer process. Photoluminescence quenching was observed in the heterostructure, indicating efficient interlayer charge transfer. Transient absorption measurements show that holes can efficiently transfer from WS2 to ReSe2 on an ultrafast timescale. Meanwhile, electron transfer from ReSe2 to WS2 was also observed. The charge-transfer properties show that monolayers of ReSe2 and WS2 form a type-II band alignment, instead of type-I as predicted by theory. The type-II alignment is further confirmed by the observation of extended photocarrier lifetimes in the heterostructure. These results provide useful information for developing van der Waals heterostructure involving ReSe2 for novel electronic and optoelectronic applications and introduce ReSe2 to the family of two-dimensional materials to construct van der Waals heterostructures.

Keywords

semiconductingoptical properties
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 11: Focus Section: Heterogeneity in Beyond Graphene 2D Materials , 15 June 2020 , pp. 1417 - 1423
Copyright
Copyright © Materials Research Society 2019

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