Abstract
The electrical conductivity, Seebeck coefficient and thermal conductivity of the Cu1−xIn1−ySe2.05 alloys were investigated, which were synthesized by solid-state reaction method combined with spark plasma sintering (SPS) technique. With the increasing of vacancy contents, the electron and phonon scattering were enhanced. The electrical and thermal transport properties of the samples changed accordingly. The Cu0.99InSe2.05 bulk sample achieves the highest ZT value of 0.31 at 773K due to optimized electrical and thermal transport properties, which is 3 times higher than that of pristine CuInSe2.05. Moreover, it is the highest ZT value in CuInSe2 system in all of previous literatures.
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