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Effect of grain size on thermal transport in post-annealed antimony telluride thin films

The effects of grain size and strain on the temperature-dependent thermal transport of antimony telluride (Sb(2)Te(3)) thin films, controlled using post-annealing temperatures of 200°C to 350°C, were investigated using the 3-omega method. The measured total thermal conductivities of 400-nm-thick thi...

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Detalles Bibliográficos
Autores principales: Park, No-Won, Lee, Won-Yong, Hong, Ji-Eun, Park, Tae-Hyun, Yoon, Soon-Gil, Im, Hyunsik, Kim, Hyung Sang, Lee, Sang-Kwon
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer US 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4384892/
https://www.ncbi.nlm.nih.gov/pubmed/25852318
http://dx.doi.org/10.1186/s11671-015-0733-6
Descripción
Sumario:The effects of grain size and strain on the temperature-dependent thermal transport of antimony telluride (Sb(2)Te(3)) thin films, controlled using post-annealing temperatures of 200°C to 350°C, were investigated using the 3-omega method. The measured total thermal conductivities of 400-nm-thick thin films annealed at temperatures of 200°C, 250°C, 300°C, 320°C, and 350°C were determined to be 2.0 to 3.7 W/m · K in the 20 to 300 K temperature range. We found that the film grain size, rather than the strain, had the most prominent effect on the reduction of the total thermal conductivity. To confirm the effect of grain size on temperature-dependent thermal transport in the thin films, the experimental results were analyzed using a modified Callaway model approach.