Journal of Electronic Materials

, Volume 41, Issue 6, pp 1820–1825

Thermoelectric Transport in InGaAs with High Concentration of Rare-Earth TbAs Embedded Nanoparticles

  • Ekaterina Selezneva
  • Laura E. Clinger
  • Ashok T. Ramu
  • Gilles Pernot
  • Trevor E. Buehl
  • Tela Favaloro
  • Je-Hyeong Bahk
  • Zhixi Bian
  • John E. Bowers
  • Joshua M. O. Zide
  • Ali Shakouri
Article

DOI: 10.1007/s11664-012-2097-3

Cite this article as:
Selezneva, E., Clinger, L.E., Ramu, A.T. et al. Journal of Elec Materi (2012) 41: 1820. doi:10.1007/s11664-012-2097-3

Thermoelectric transport properties of InGaAs with a high concentration of embedded semimetallic TbAs nanoparticles were studied in a 300–600 K temperature range. The TbAs concentrations studied were over 1% in a regime where coherent multiple scattering could affect electron transport. Scattering by ionized embedded nanoparticles, which are approximately one nanometer in diameter, is significantly different from scattering by shallow ionized impurities. The Seebeck coefficient and electrical conductivity were characterized as a function of temperature. The coefficients showed unusual behavior for a typical semiconductor, both growing with temperature. However, drastic worsening of the electrical conductivity compared with Si-doped InGaAs was also observed. The measured room temperature thermal conductivities of TbAs:InGaAs nanocomposites were lower than those of Si-doped InGaAs. Nonetheless, the thermoelectric performance was still governed by the electrical conductivity, and no enhancement of the thermoelectric figure of merit ZT was achieved at room temperature.

Keywords

Thermoelectricsnanoparticleselectrical transport

Copyright information

© TMS 2012

Authors and Affiliations

  • Ekaterina Selezneva
    • 1
    • 2
  • Laura E. Clinger
    • 3
  • Ashok T. Ramu
    • 4
  • Gilles Pernot
    • 1
  • Trevor E. Buehl
    • 5
  • Tela Favaloro
    • 1
  • Je-Hyeong Bahk
    • 1
  • Zhixi Bian
    • 1
  • John E. Bowers
    • 4
  • Joshua M. O. Zide
    • 3
  • Ali Shakouri
    • 1
  1. 1.Electrical Engineering DepartmentUniversity of California-Santa CruzSanta CruzUSA
  2. 2.University of Milano-BicoccaMilanItaly
  3. 3.Department of Materials Science and EngineeringUniversity of DelawareNewarkUSA
  4. 4.Electrical and Computer Engineering DepartmentUniversity of California-Santa BarbaraSanta BarbaraUSA
  5. 5.Materials DepartmentUniversity of California-Santa BarbaraSanta BarbaraUSA