中国物理B ›› 2022, Vol. 31 ›› Issue (8): 87803-087803.doi: 10.1088/1674-1056/ac657b

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Enhanced photoluminescence of monolayer MoS2 on stepped gold structure

Yu-Chun Liu(刘玉春), Xin Tan(谭欣), Tian-Ci Shen(沈天赐), and Fu-Xing Gu(谷付星)   

  1. School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
  • 收稿日期:2022-02-09 修回日期:2022-04-05 接受日期:2022-04-08 出版日期:2022-07-18 发布日期:2022-07-23
  • 通讯作者: Fu-Xing Gu E-mail:gufuxing@usst.edu.cn
  • 基金资助:
    Project supported by the China Postdoctoral Science Foundation (Grant No. 2020M671168) and the National Natural Science Foundation of China (Grant No. 62075131).

Enhanced photoluminescence of monolayer MoS2 on stepped gold structure

Yu-Chun Liu(刘玉春), Xin Tan(谭欣), Tian-Ci Shen(沈天赐), and Fu-Xing Gu(谷付星)   

  1. School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
  • Received:2022-02-09 Revised:2022-04-05 Accepted:2022-04-08 Online:2022-07-18 Published:2022-07-23
  • Contact: Fu-Xing Gu E-mail:gufuxing@usst.edu.cn
  • Supported by:
    Project supported by the China Postdoctoral Science Foundation (Grant No. 2020M671168) and the National Natural Science Foundation of China (Grant No. 62075131).

摘要: 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.

关键词: MoS2, stepped gold, heterostructures, enhanced photoluminescence

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.

Key words: MoS2, stepped gold, heterostructures, enhanced photoluminescence

中图分类号:  (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)

  • 78.67.-n
78.55.-m (Photoluminescence, properties and materials) 71.35.-y (Excitons and related phenomena) 71.35.Pq (Charged excitons (trions))