Isovalent substitutes play in different ways: Effects of isovalent substitution on the thermoelectric properties of CoSi0.98B0.02

Sun, Hui; Lu, Xu; Morelli, Donald T.

doi:10.1063/1.4959209

Title: Isovalent substitutes play in different ways: Effects of isovalent substitution on the thermoelectric properties of CoSi0.98B0.02

Journal Article · Thu Jul 21 00:00:00 EDT 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4959209· OSTI ID:1261103

^[1]; Lu, Xu ^[2]; Morelli, Donald T. ^[3]

Anhui Institute of Information Technology, Anhui (China). Dept. of Basic Teaching
Chongqing Univ., Chongqing (China). College of Physics
Michigan State Univ., East Lansing, MI (United States). Dept. of Chemical Engineering and Materials Science

Boron-added CoSi, CoSi_0.98B_0.02, possesses a very high thermoelectric power factor of 60 μW cm^-1 K^-2 at room temperature, which is among the highest power factors that have ever been reported for near-room-temperature thermoelectric applications. Since the electrical properties of this material have been tuned properly, isovalent substitution for its host atoms are intentionally employed to reduce the lattice thermal conductivity while maintaining the electronic properties unchanged. In our previous work, the effect of Rh substitution for Co atoms on the thermoelectric properties of CoSi_0.98B_0.02 has been studied. Here we present a study of the substitution of Ge for Si atoms in this compound. Even though Ge and Rh are isovalent with their corresponding host atoms, they play different roles in determining the electrical and thermal transport properties. Through the evaluation of the lattice thermal conductivity by the Debye approximation and the comparison between the high-temperature Seebeck coefficients, we propose that Rh substitution leads to a further overlapping of the conduction and the valence bands while Ge substitution only shifts the Fermi level upward into the conduction band. Lastly, our results show that the influence of isovalent substitution on the electronic structure cannot be ignored when the alloying method is used to improve thermoelectric properties.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Revolutionary Materials for Solid State Energy Conversion (RMSSEC); Anhui Institute of Information Technology, Anhui (China)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0001054

OSTI ID:: 1261103

Journal Information:: Journal of Applied Physics, Vol. 120, Issue 3; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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