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Electrical and thermal transports of binary copper sulfides Cux
S with x
from 1.8 to 1.96
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In this study, a series of copper sulfides Cu
xS with x spanning from 1.8 to 1.96 was prepared and their crystal structures, elemental valence states, and thermoelectric properties were systematically studied. The valence state of Cu in Cu
xS is unchanged as the ratio of Cu/S varies, while the thermoelectric properties are very sensitive to the deficiency of Cu. In addition, the type of sulfur arrangement in the crystal structure also plays an important role on the electrical transports. Finally, the optimum Cu/S atomic ratios in the binary Cu
xS system were identified for high power factor and thermoelectric figure of merit.
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