Temperature dependence of the Raman spectra of Bi2Te3 and Bi0.5Sb1.5Te3 thermoelectric films |
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| Authors: | Duanhui Li Liangliang Li Da‐Wei Liu Jing‐Feng Li |
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| Institution: | 1. Department of Materials Science and Engineering, Key Laboratory of Advanced Materials, Tsinghua University, Beijing 100084, P.R. China;2. Department of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, P.R. China |
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| Abstract: | The temperature dependence of the Raman spectra of Bi2Te3 and Bi0.5Sb1.5Te3 thermoelectric films was investigated. The temperature coefficients of the Eg(2) peak positions were determined as –0.0137 cm–1/°C and –0.0156 cm–1/°C, respectively. The thermal expansion of the crystal caused a linear shift of the Raman peak induced by the temperature change. Based on the linear relation, a reliable and noninvasive micro‐Raman scattering method was shown to measure the thermal conductivity of the thermoelectric films. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |
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| Keywords: | thermoelectric materials thin films Raman spectroscopy thermal expansion thermal conductivity Bi2Te3 |
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