Temperature-dependent phonon dynamics of supported and suspended monolayer tungsten diselenide
Source abstract
Abstract
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.
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Research context
OpenAlex topics: 2D Materials and Applications · Thermal properties of materials · Advanced Thermoelectric Materials and Devices
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Departament of Physics, Federal University of Piauí 1 , Teresina, Piauí, 64049-550, Brazil
LIMAV-Interdisciplinary Laboratory of Advanced Materials, Materials Science and Engineering Graduate Program (PPGCM), Federal University of Piauí 2 , Teresina, Piauí, 64049-550, Brazil
Department of Physics, Federal University of Maranhao 3 , São Luíz, Maranhão, 65.085-580, Brazil
Department of Physics, Federal University of Lavras 4 , Lavras, Minas Gerais, 37200-000, Brazil
Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory 5 , Dr Homi Bhabha Road, Pune 411008, India
Academy of Scientific and Innovative Research (AcSIR) 6 , Ghaziabad 201002, India
LIMAV-Interdisciplinary Laboratory of Advanced Materials, Materials Science and Engineering Graduate Program (PPGCM), Federal University of Piaui 7 , Teresina, Piaui, 64049-550, Brazil
Departament of Physics, Federal University of Ceará 8 , Fortaleza, Ceará, 60455-900, Brazil
College of Physics, Federal University of Pará 9 , Belém, Pará, 66075-110, Brazil
Funding
Fundação de Amparo à Pesquisa do Estado do Piauí · Coordenação de Aperfeiçoamento de Pessoal de Nível Superior · Conselho Nacional de Desenvolvimento Científico e Tecnológico · Fundação de Amparo à Pesquisa e ao Desenvolvimento Científico e Tecnológico do Maranhão
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