Enhancement of the Thermoelectric Performance of Polycrystalline In4Se2.5 by Copper Intercalation and Bromine Substitution

Thermoelectric (TE) materials and devices, stimulated by increasing demand for electricity around the world, are being intensively investigated because of their capability to directly convert heat of automobile exhaust and various industrial processes into electricity. [ 1 ] Usually, the scale of the capability is determined by the dimensionless fi gure of merit ZT = S 2 σT / κ , in which S , σ , κ , and T are the Seebeck coeffi cient, the electrical conductivity, the thermal conductivity, and the absolute temperature at which the properties are measured, respectively. Therefore, the pursuance of high ZT has traced the path of lowering the thermal conductivity and improving the power factor ( S 2 σ ). [ 2–6 ]

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