Temperature- and power-dependent phonon properties of suspended continuous WS2 monolayer films

This manuscript reports temperature- and power-dependence of in-plane E12g and out-of-plane A1g Raman modes in a continuous WS2 monolayer film (CWMF) prepared using low pressure chemical vapor deposition (LPCVD), suspended on a perforated substrate. The frequencies of these two phonon modes vary lin...

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Bibliographic Details
Published in:Vibrational spectroscopy 2016-09, Vol.86, p.270-276
Main Authors: Vieira, Anderson G., Luz-Lima, Cleanio, Pinheiro, Gardenia S., Lin, Zhong, Rodríguez-Manzo, Julio A., Perea-López, Nestor, Elías, Ana Laura, Drndić, Marija, Terrones, Mauricio, Terrones, Humberto, Viana, Bartolomeu C.
Format: Article
Language:English
Subjects:
Raman spectroscopy
Thermal conductivity
TMDs
WS2
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Summary:This manuscript reports temperature- and power-dependence of in-plane E12g and out-of-plane A1g Raman modes in a continuous WS2 monolayer film (CWMF) prepared using low pressure chemical vapor deposition (LPCVD), suspended on a perforated substrate. The frequencies of these two phonon modes vary linearly with temperature (77–523K) and power (2–14μW), and the modes soften as local temperature increases. The first-order temperature coefficients for E12g and A1g modes are 0.0124 and 0.0112cm−1/K, respectively, and power coefficients are 0.1228 and 0.1381cm−1/μW. Using the 1D Balandin’s approach, we have calculated the thermal conductivity of the suspended CWMF at room temperature to be ca. 20 and 16W/mK when considering the E12g and A1g modes, respectively. Our results provide thermal properties values of CWMF, which are very important for developing monolayer WS2 electronic devices.
ISSN:0924-2031
1873-3697
DOI:10.1016/j.vibspec.2016.08.004