High thermoelectric properties of p-type BiCuSeO co−doped with Ca2+ and Ba2+

D. H. Kim, H. Y. Hong, K. Park

Research output: Contribution to journalArticlepeer-review

Abstract

In this work, we prepare Ca2+ and Ba2+ co−doped BiCuSeO using a solid−state reaction, followed by spark plasma sintering. Ca2+/Ba2+ co−doping significantly increases the electrical conductivity through the increased hole concentration. In addition to the increased power factor, Ca2+/Ba2+ co−doping reduces the phonon thermal conductivity through grain refinement, increased porosity, and mass and strain field fluctuations. The combination of the largest power factor and the low phonon thermal conductivity for Bi0.80Ca0.10Ba0.10CuSeO yields the largest dimensionless figure−of−merit (ZT). The ZT of Bi0.80Ca0.10Ba0.10CuSeO (0.60) at 600 °C is two times larger than that of the undoped BiCuSeO (0.30) at 600 °C. We systematically discuss the effect of the Ca2+/Ba2+ co−doping on the thermoelectric properties of BiCuSeO oxyselenide.

Original languageEnglish
Article number159969
JournalJournal of Alloys and Compounds
Volume876
DOIs
Publication statusPublished - 2021 Sep 25
Externally publishedYes

Keywords

  • Crystal structure
  • Electrical transport
  • Oxide materials
  • Sintering
  • Thermoelectric

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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