Fe-doping effect on thermoelectric properties of p-type Bi0.48Sb1.52Te3

Hyeona Mun, Kyu Hyoung Lee, Suk Jun Kim, Jong Young Kim, Jeong Hoon Lee, Jae Hong Lim, Hee Jung Park, Jong Wook Roh, Sung Wng Kim

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18 Citations (Scopus)

Abstract

The substitutional doping approach has been shown to be an effective strategy to improve ZT of Bi2Te3-based thermoelectric raw materials. We herein report the Fe-doping effects on electronic and thermal transport properties of polycrystalline bulks of p-type Bi0.48Sb1.52Te3. After a small amount of Fe-doping on Bi/Sb-sites, the power factor could be enhanced due to the optimization of carrier concentration. Additionally, lattice thermal conductivity was reduced by the intensified point-defect phonon scattering originating from the mass difference between the host atoms (Bi/Sb) and dopants (Fe). An enhanced ZT of 1.09 at 300 K was obtained in 1.0 at% Fe-doped Bi0.48Sb1.52Te3 by these synergetic effects.

Original languageEnglish
Pages (from-to)959-965
Number of pages7
JournalMaterials
Volume8
Issue number3
DOIs
Publication statusPublished - 2015 Jan 1

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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