Influence of doping and solid solution formation on the thermoelectric properties of chalcopyrite semiconductors

Winston D. Carr, Donald T. Morelli

Research output: Contribution to journalArticle

  • 16 Citations

Abstract

We have investigated the influence of zinc doping on the thermoelectric properties of CuInTe2-CuGaTe2 solid solution alloys. Undoped end-member compounds display typical p-type semiconducting behavior, with a negative temperature coefficient of resistivity and large Seebeck coefficient. With zinc substituting for indium or gallium, the hole concentration is increased and the electrical transport behavior evolves into that of a degenerate semiconductor, with both electrical resistivity and Seebeck coefficient increasing with temperature up to the highest temperature measured. For undoped samples the thermoelectric power factor is maximized close to 750 K, while in doped specimens the maximum occurs at much lower temperature. Substitution of gallium for indium induces significant phonon scattering and thermal conductivity reduction below 500 K. The dimensionless figure of merit rises to above unity over a range of compositions in these chalcopyrite compounds, with optimized samples reaching a figure of merit of 1.3.

LanguageEnglish (US)
Pages277-281
Number of pages5
JournalJournal of Alloys and Compounds
Volume630
DOIs
StatePublished - May 5 2015

Profile

Solid solutions
Gallium
Indium
Seebeck coefficient
Doping (additives)
Semiconductor materials
Zinc
Negative temperature coefficient
Hole concentration
Phonon scattering
Thermoelectric power
Temperature
Thermal conductivity
Substitution reactions
Chemical analysis
chalcopyrite

Keywords

  • Powder metallurgy
  • Semiconductors
  • Thermoelectric

ASJC Scopus subject areas

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

Cite this

Influence of doping and solid solution formation on the thermoelectric properties of chalcopyrite semiconductors. / Carr, Winston D.; Morelli, Donald T.

In: Journal of Alloys and Compounds, Vol. 630, 05.05.2015, p. 277-281.

Research output: Contribution to journalArticle

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