TY - JOUR
T1 - Temperature- and power-dependent phonon properties of suspended continuous WS2 monolayer films
AU - Vieira, Anderson G.
AU - Luz-Lima, Cleanio
AU - Pinheiro, Gardenia S.
AU - Lin, Zhong
AU - Rodríguez-Manzo, Julio A.
AU - Perea-López, Nestor
AU - Elías, Ana Laura
AU - Drndić, Marija
AU - Terrones, Mauricio
AU - Terrones, Humberto
AU - Viana, Bartolomeu C.
N1 - Funding Information:
B.C. Viana, acknowledges the support from the MCTI/CNPQ/Universal 14/2013 (Grants# 471713/2013-9 ), and the Produtividade em Pesquisa-PQ-2013 (Grants# 303632/2013-5 ). C.L. Lima, also acknowledges the support from the MCTI/CNPQ/Universal 14/2014 (Grants# 454491/2014-0 ) and the Produtividade em Pesquisa-PQ-2013 (Grants# 306052/2014-8 ). We also acknowledge the support from the U.S. Army Research Office MURI grant W911NF-11-1-0362.
PY - 2016/9/1
Y1 - 2016/9/1
N2 - 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.
AB - 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.
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U2 - 10.1016/j.vibspec.2016.08.004
DO - 10.1016/j.vibspec.2016.08.004
M3 - Article
AN - SCOPUS:84982252214
VL - 86
SP - 270
EP - 276
JO - Vibrational Spectroscopy
JF - Vibrational Spectroscopy
SN - 0924-2031
ER -