Enhanced thermoelectric properties in p-type Bi0.4Sb1.6Te3 alloy by combining incorporation and doping using multi-scale CuAlO2 particles

Zijun Song, Qihao Zhang, Yuan Liu, Zhenxing Zhou, Xiaofang Lu, Lianjun Wang, Wan Jiang, Lidong Chen

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Multi-scale CuAlO2 particles are introduced into the Bi0.4Sb1.6Te3 matrix to synergistically optimize the electrical conductivity, Seebeck coefficient, and the lattice thermal conductivity. Cu element originating from fine CuAlO2 grains diffuses into the Bi0.4Sb1.6Te3 matrix and tunes the carrier concentration while the coarse CuAlO2 particles survive as the second phase within the matrix. The power factor is improved at the whole temperatures range due to the low-energy electron filtering effect on Seebeck coefficient and enhanced electrical transport property by mild Cu doping. Meanwhile, the remaining CuAlO2 inclusions give rise to more boundaries and newly built interfaces scattering of heat-carrying phonons, resulting in the reduced lattice thermal conductivity. Consequently, the maximum ZT is found to be enhanced by 150% arising from the multi-scale microstructure regulation when the CuAlO2 content reaches 0.6 vol.%. Not only that, but the ZT curves get flat in the whole temperature range after introducing the multi-scale CuAlO2 particles, which leads to a remarkable increase in the average ZT.

Original languageEnglish
Article number1600451
JournalPhysica Status Solidi (A) Applications and Materials Science
Volume214
Issue number1
DOIs
Publication statusPublished - 2017 Jan 1
Externally publishedYes

Keywords

  • BiSbTe alloy
  • multi-scale CuAlO particles
  • thermoelectric properties

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Enhanced thermoelectric properties in p-type Bi<sub>0.4</sub>Sb<sub>1.6</sub>Te<sub>3</sub> alloy by combining incorporation and doping using multi-scale CuAlO<sub>2</sub> particles'. Together they form a unique fingerprint.

Cite this