Study on anisotropy and optimization of thermoelectric properties of thermoelectric materials by a Seebeck micro-probe method

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In this study, a two-dimensional Seebeck coefficient measurement system has been developed by a micro-probe method and two-dimensional distribution of Seebeck coefficient has evaluated for various thermoelectric materials. It is revealed that the anisotropic Seebeck coefficient reflecting the grain distribution in the zinc-antimonide system. In the bismuth-terullide system, it is found that the sign inversion of the Seebeck coefficient from p- to n-type occurs originating from the gradient of the excess Te content along the crystal growth direction. As a result, the evaluation method of microscopic thermoelectric properties has been established by using the Seebeck micro-probe method. It is expected that the Seebeck micro-probe method becomes one of the new and powerful ways for measurement of microscopic physical properties for various functional materials.