Enhanced photoluminescence of monolayer MoS2 on stepped gold structure

doi:10.1088/1674-1056/ac657b

Abstract Different MoS₂/Au heterostructures can play an important role in tuning the photoluminescence (PL) and optoelectrical properties of monolayer MoS₂. Previous studies of PL of MoS₂/Au heterostructures were mainly limited to the PL enhancement by using different Au nanostructures and PL quenching of monolayer MoS₂ on flat Au surfaces. Here, we demonstrate the enhanced excitonic PL emissions of monolayer MoS₂/Au heterostructures on Si/SiO₂ substrates. By transferring the continuous monolayer MoS₂ onto a stepped Au structure consisting of 60-nm and 100-nm Au films, the MoS₂/Au-60 and MoS₂/Au-100 heterostructures exhibit enhanced PL emissions, each with a blue-shifted PL peak in comparison with the MoS₂/SiO₂. Furthermore, the PL intensity of MoS₂/Au-60 is about twice larger than that of MoS₂/Au-100. The different enhanced excitonic PL emissions in MoS₂/Au heterostructures can be attributed to the different charge transfer effects modified by the stepped Au structure. This work may provide an insight into the excitonic PL and charge transfer effect of MoS₂ on Au film and yield novel phenomena in MoS₂/Au heterostructures for further study of PL tuning and optoelectrical properties.

Keywords: MoS₂ stepped gold heterostructures enhanced photoluminescence

Received: 09 February 2022
Revised: 05 April 2022
Accepted manuscript online: 08 April 2022

PACS:	78.67.-n	(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
	78.55.-m	(Photoluminescence, properties and materials)
	71.35.-y	(Excitons and related phenomena)
	71.35.Pq	(Charged excitons (trions))

Fund: Project supported by the China Postdoctoral Science Foundation (Grant No. 2020M671168) and the National Natural Science Foundation of China (Grant No. 62075131).

Corresponding Authors: Fu-Xing Gu
E-mail: gufuxing@usst.edu.cn

Cite this article:

Yu-Chun Liu(刘玉春), Xin Tan(谭欣), Tian-Ci Shen(沈天赐), and Fu-Xing Gu(谷付星) Enhanced photoluminescence of monolayer MoS₂ on stepped gold structure 2022 Chin. Phys. B 31 087803

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Enhanced photoluminescence of monolayer MoS2 on stepped gold structure

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Enhanced photoluminescence of monolayer MoS₂ on stepped gold structure