Temperature-dependent phonon dynamics of supported and suspended monolayer tungsten diselenide
Thais C. V. Carvalho,
Francisco D. V. Araujo,
Clenilton Costa dos Santos,
Luciana M. R. Alencar,
Jenaina Ribeiro-Soares,
Dattatray J. Late,
Anderson Oliveira Lobo,
Antonio Gomes Souza Filho,
Rafael S. Alencar,
Bartolomeu C. Viana
Affiliations
Thais C. V. Carvalho
Departament of Physics, Federal University of Piauí, Teresina, Piauí, 64049-550, Brazil
Francisco D. V. Araujo
LIMAV-Interdisciplinary Laboratory of Advanced Materials, Materials Science and Engineering Graduate Program (PPGCM), Federal University of Piauí, Teresina, Piauí, 64049-550, Brazil
Clenilton Costa dos Santos
Department of Physics, Federal University of Maranhao, São Luíz, Maranhão, 65.085-580, Brazil
Luciana M. R. Alencar
Department of Physics, Federal University of Maranhao, São Luíz, Maranhão, 65.085-580, Brazil
Jenaina Ribeiro-Soares
Department of Physics, Federal University of Lavras, Lavras, Minas Gerais, 37200-000, Brazil
Dattatray J. Late
Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr Homi Bhabha Road, Pune 411008, India
Anderson Oliveira Lobo
LIMAV-Interdisciplinary Laboratory of Advanced Materials, Materials Science and Engineering Graduate Program (PPGCM), Federal University of Piaui, Teresina, Piaui, 64049-550, Brazil
Antonio Gomes Souza Filho
Departament of Physics, Federal University of Ceará, Fortaleza, Ceará, 60455-900, Brazil
Rafael S. Alencar
College of Physics, Federal University of Pará, Belém, Pará, 66075-110, Brazil
Bartolomeu C. Viana
Departament of Physics, Federal University of Piauí, Teresina, Piauí, 64049-550, Brazil
Two-dimensional materials exhibit great potential for high-performance electronics applications and the knowledge of their thermal properties is extremely necessary, since they are closely related to efficient heat dissipation and electron-phonon interactions. In this study we report the temperature-dependence of the out-of-plane A1g Raman mode of suspended and supported CVD-grown single-crystalline tungsten diselenide (WSe2) monolayer. The A1g phonon wavenumber is linearly red-shifted for temperature ranging from 98 to 513 K, with first-order temperature coefficients β of -0.0044 and -0.0064 cm−1/K for suspended and supported monolayer WSe2, respectively. The higher β module value for supported sample is attributed to the increase of the phonon anharmonicity due to the phonon scattering with the surface roughness of the substrate. Our analysis of the temperature-dependent phonon dynamics reveal the influence of the substrate on thermal properties of monolayer WSe2 and provide fundamental information for developing of atomically-thin 2D materials devices.