Open AccessCharacterization of Layer Number of Two-Dimensional Transition Metal Diselenide Semiconducting Devices Using Si-Peak Analysis
Author(s) -
Xian Zhang
Publication year - 2019
Publication title -
advances in materials science and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 42
eISSN - 1687-8442
pISSN - 1687-8434
DOI - 10.1155/2019/7865698
Subject(s) - tungsten diselenide , raman spectroscopy , materials science , diselenide , graphene , molybdenum disulfide , layer (electronics) , characterization (materials science) , band gap , photoluminescence , tungsten disulfide , nanotechnology , optoelectronics , analytical chemistry (journal) , transition metal , optics , composite material , metallurgy , biochemistry , chemistry , physics , selenium , catalysis , chromatography
Atomically thin materials such as semiconducting transition metal diselenide materials, like molybdenum diselenide (MoSe 2 ) and tungsten diselenide (WSe 2 ), have received intensive interests in recent years due to their unique electronic structure, bandgap engineering, ambipolar behavior, and optical properties and have motivated investigations for the next-generation semiconducting electronic devices. In this work, we show a nondestructive method of characterizing the layer number of two-dimensional (2-D) MoSe 2 and WSe 2 including single- and few-layer materials by Raman spectroscopy. The related photoluminescence properties are also studied as a reference. Although Raman spectroscopy is a powerful tool for determining the layer number of 2-D materials such as graphene and molybdenum disulfide (MoS 2 ), there have been difficulties in precisely characterizing the layer number for MoSe 2 and WSe 2 by Raman spectroscopy due to the uncertain shifts during the Raman measurement process and the lack of multiple separated Raman peaks in MoSe 2 and WSe 2 for referencing. We then compared the normalized Si peak with MoSe 2 and WSe 2 and successfully identified the layer number of MoSe 2 and WSe 2 . Similar to graphene and MoS 2 , the sample layer number is found to modify their optical properties up to 4 layers.