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

Anderson G. Vieira, Cleanio Luz-Lima, Gardenia S. Pinheiro, Zhong Lin, Julio A. Rodríguez-Manzo, Nestor Perea-López, Ana Laura Elías, Marija Drndić, Mauricio Terrones, Humberto Terrones, Bartolomeu C. Viana

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

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 (77–523 K) and power (2–14 μW), and the modes soften as local temperature increases. The first-order temperature coefficients for E12g and A1g modes are 0.0124 and 0.0112 cm−1/K, respectively, and power coefficients are 0.1228 and 0.1381 cm−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 16 W/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.

Original languageEnglish (US)
Pages (from-to)270-276
Number of pages7
JournalVibrational Spectroscopy
Volume86
DOIs
StatePublished - Sep 1 2016

All Science Journal Classification (ASJC) codes

  • Spectroscopy

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