Enhanced photoluminescence of monolayer MoS_(2)on stepped gold structure  

作　　者：Yu-Chun Liu Xin Tan Tian-Ci Shen Fu-Xing Gu 刘玉春;谭欣;沈天赐;谷付星(School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China

出　　处：《Chinese Physics B》2022年第8期639-644,共6页中国物理B（英文版）

基　　金：Project supported by the China Postdoctoral Science Foundation(Grant No.2020M671168);the National Natural Science Foundation of China(Grant No.62075131)。

摘　　要：Different Mo S_(2)/Au heterostructures can play an important role in tuning the photoluminescence(PL)and optoelectrical properties of monolayer Mo S_(2).Previous studies of PL of Mo S_(2)/Au heterostructures were mainly limited to the PL enhancement by using different Au nanostructures and PL quenching of monolayer Mo S_(2)on flat Au surfaces.Here,we demonstrate the enhanced excitonic PL emissions of monolayer Mo S_(2)/Au heterostructures on Si/Si O_(2)substrates.By transferring the continuous monolayer Mo S_(2)onto a stepped Au structure consisting of 60-nm and 100-nm Au films,the Mo S_(2)/Au-60 and Mo S_(2)/Au-100 heterostructures exhibit enhanced PL emissions,each with a blue-shifted PL peak in comparison with the Mo S_(2)/Si O_(2).Furthermore,the PL intensity of Mo S_(2)/Au-60 is about twice larger than that of Mo S_(2)/Au-100.The different enhanced excitonic PL emissions in Mo S_(2)/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 Mo S_(2)on Au film and yield novel phenomena in Mo S_(2)/Au heterostructures for further study of PL tuning and optoelectrical properties.

关 键 词：MoS_(2) stepped gold HETEROSTRUCTURES enhanced photoluminescence 

分 类 号：TB34[一般工业技术—材料科学与工程]