20November2018

Nano-Micro Letters

Enhanced Performance of a Monolayer MoS2/WSe2 Het-erojunction as a Photoelectrochemical Cathode

Jingwei Xiao1, Yu Zhang1, *, Huanjun Chen1, Ningsheng Xu1, Shaozhi Deng1

Abstract
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Nano-Micro Lett. (2018) 10: 60

First Online: 13 June 2018 (Article)

DOI:10.1007/s40820-018-0212-6

*Corresponding author. E-mail: stszhyu@mail.sysu.edu.cn

 

Abstract

 


Toc

Transition-metal dichalcogenide (TMD) semiconductors have attracted interest as photoelectrochemical (PEC) electrodes due to their novel band-gap structures, optoelectronic properties, and photocatalytic activities. However, the photo-harvesting efficiency still requires improvement. In this study, A TMD stacked heterojunction structure was adopted to further enhance the performance of the PEC cathode. A P-type WSe2 and an N-type MoS2 monolayer were stacked layer-by-layer to build a ultrathin vertical heterojunction using a micro fabrication method. In-situ measurement was employed to characterize the intrinsic PEC performance on a single sheet heterostructure. Benefitting from its built-in electric field and type II band alignment, the MoS2/WSe2 bilayer heterojunction exhibited exceptional photocatalytic activity and a high incident photo-to-current conversion efficiency (IPCE). Comparing with the monolayer WSe2 cathode, the PEC current and the IPCE of the bilayer heterojunction increased by a factor of 5.6 and enhanced 50%, respectively. The intriguing performance renders the MoS2/WSe2 heterojunction attractive for application in high-performance PEC water splitting.


 

Keywords

MoS2/WSe2; Monolayer; Bilayer; Heterojunction; Photoelectrochemical cathode

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