Ab initio design of new cobalt-based half-Heusler materials for thermoelectric applications

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Mohd Zeeshan - , Indian Institute of Technology Roorkee (Author)
  • Harish K. Singh - , Technische Universität Darmstadt (Author)
  • Jeroen Van Den Brink - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Hem C. Kandpal - , Indian Institute of Technology Roorkee, Leibniz Institute for Solid State and Materials Research Dresden (Author)

Abstract

In search of new prospects for thermoelectric materials, using ab initio calculations and semiclassical Boltzmann theory, we have systematically investigated the electronic structure and transport properties of 18-valence electron count cobalt-based half-Heusler alloys with prime focus on CoVSn, CoNbSn, CoTaSn, CoMoIn, and CoWIn. The effect of doping on transport properties has been studied under the rigid band approximation. The maximum power factor, S2σ, for all systems is obtained on hole doping and is comparable to the existing thermoelectric material CoTiSb. The stability of all the systems is verified by phonon calculations. Based on our calculations, we suggest that CoVSn, CoNbSn, CoTaSn, CoMoIn, and CoWIn could be potential candidates for higherature thermoelectric materials.

Details

Original languageEnglish
Article number075407
JournalPhysical review materials
Volume1
Issue number7
Publication statusPublished - 12 Dec 2017
Peer-reviewedYes
Externally publishedYes