Open AccessOptical identification of MoS_2/graphene heterostructure on SiO_2/Si substrate
Author(s) -
Haiteng Xu,
Dawei He,
Ming Fu,
Wenshuo Wang,
Hongpeng Wu,
Yongsheng Wang
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.015969
Subject(s) - heterojunction , chemical vapor deposition , materials science , graphene , raman spectroscopy , substrate (aquarium) , optoelectronics , fresnel equations , optics , nanotechnology , refractive index , physics , oceanography , geology
Chemical vapor deposition (CVD) method is considered to be an efficient way to prepare Van der Waals heterostructure. However, accurately and hurtlessly identifying the layers number of MoS(2) in the heterostructure is still a challenge. Here, we calculated the expected contrast between MoS(2)/graphene heterostructure and underlying SiO(2)/Si substrate by using a Fresnel law based model. And we indicated that contrast at blue and green incident light is ideal for visibility and layer number detecting. Our measured value showed good agreement with calculated ones. And Raman spectrum helped to confirm our speculation.