Effect of cationic substitution on the thermoelectric properties of In4-xMxSe2.95 compounds (M = Na, Ca, Zn, Ga, Sn, Pb; x=0.1)

초록

We report an electrical and thermal transport study for polycrystalline samples of In4Se3-x substituted with various metals. Our experimental and theoretical investigation revealed that the Na, Ca, and Pb substitutions at the In4 site in the 4:3 indium selenide lattice are more effective for increase in electron concentration than the Zn, Ga, and Sn substitutions at other sites, and the Peierls distortion in cationic substituted compounds may not be as strong as In4Se3-x based on higher lattice thermal conductivities of the former than the latter. It is found that the cationic substitutions may weaken the effect of Peierls distortion on thermal properties for In4Se3-x while they maintain the same trend for electrical properties of In4Se3-x with different electron concentrations. (C) 2011 American Institute of Physics. [doi:10.1063/1.3637053]

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