期刊
ACS NANO
卷 12, 期 10, 页码 9982-9990出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b04265
关键词
tip-enhanced Raman scattering; tungsten disulfide; transition metal dichalcogenides; defects; sulfur vacancies
类别
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2016R1A2B2015581]
- Nano-Materials Technology Development Program [NRF-2016M3A7B4025406]
- [IBS-R011-D1]
Monolayer tungsten disulfide (WS2) has emerged as an active material for optoelectronic devices due to its quantum yield of photoluminescence. Despite the enormous research about physical characteristics of monolayer WS2, the defect-related Raman scattering has been rarely studied. Here, we report the correlation of topography and Raman scattering in monolayer WS2 by using tip-enhanced resonance Raman spectroscopy and reveal defect-related Raman modes denoted as D and D' modes. We found that the sulfur vacancies introduce not only the red-shifted A(1g) mode but also the D and D' modes by the density functional theory calculations. The observed defect-related Raman modes can be utilized to evaluate the quality of monolayer WS2 and will be helpful to improve the performance of WS2 optoelectronic devices.
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