Thermoelectric properties of thin films of bismuth and bismuth-antimony solid solution
Keywords:
bismuth, bismuth-antimony, thermoEMF, size effect, power factorAbstract
The temperature dependences of the resistivity and thermoEMF were investigated by the method that excludes the occurrence of external strain in the film-substrate system, and the thermoelectric power factor was calculated in the temperature range of 77 to 300K for bismuth-antimony solid solution films on substrates with different thermal expansion coefficients. It has been found that to get the maximum thermoEMF, the ratio of the crystallite size and film thickness is critically important, which is due to the different confinement of electrons and holes mobility by the surface and crystallite boundaries. The maximum thermoEMF and power factor correspond to thick block films of Bi0.88Sb0.12 on mica.The research was supported by the Ministry of Education of the Russian Federation as part of a state assignment (project No. FSZN-2020-0026). Вibl. 19, Fig. 7, Tabl. 1.
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