Abstract
We prepared and investigated the thermoelectric properties of Cu0.4InTe2 at 310–710 K. The crystal structure of Cu0.4InTe2 was identical to that of CuIn3Te5, namely a tetragonal structure, space group P4̄2c, known as an ordered defect chalcopyrite. This structure is different from that of CuInTe2, which has a normal chalcopyrite structure. In comparison with CuInTe2, Cu0.4InTe2 showed inferior thermoelectric properties because a degradation in its electrical conductivity outweighed a reduction in its thermal conductivity. The maximum dimensionless figure of merit of Cu0.4InTe2 was 0.17 at 702 K.
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