Abstract
We report fabrication of compacted Bi0.5Sb1.5Te3 composites by adding 1wt% of carbon spheres in the hydrothermal synthesis. The processing parameter of sintering temperature is investigated in order to optimize the thermoelectric power factor of pressed Bi0.5Sb1.5Te3 composites. As a result, we find that the composite sintered at 360°C shows the best power factor performance among the composites and has a largest power factor of 15.4μW/cmK2 at 205K and 13.5μW/cmK2 at 290K. When compared with the samples without addition of carbon sphere in the hydrothermal synthesis, the composites sintered at 340°C and 360°C both surpass the largest power factor of 12.1μW/cmK2 at 280K and 11.9μW/cmK2 at 290K for the 340°C-sintered counterpart.
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