Abstract
In this study, the dense bulk Cu2Se thermoelectric (TE) materials were prepared by microwave melting and hot pressing sintering. The effects of different cooling processes on the microstructure and TE properties of Cu2Se were investigated. The results showed that the Cu2Se TE material prepared by microwave synthesis had high electrical conductivity, which was about 105 S⋅m[Formula: see text]. The annealing process can lead to grain growth of Cu2Se and the formation of micropores in the Cu2Se, which deteriorated the thermal conductivity. The Cu2Se material prepared by the microwave melting and slow cooling process had the best TE performance, and the ZT value can reach 0.68 at 700 K.
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