A prototype thermoelectric module based on p-type colusite together with n-type nanostructured PbTe for power generation

Raju Chetty, Priyanka Jood, Masayuki Murata, Koichiro Suekuni, Michihiro Ohta

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Thermoelectric power generation from the prototype π-shaped module composed of p-type colusite (Cu26Cr2Ge6S32) and n-type nanostructured PbTe (Pb0.98Ga0.02Te-3% GeTe) was demonstrated in this study. The thermoelectric figure of merit zT of Cu26Cr2Ge6S32 and Pb0.98Ga0.02Te-3% GeTe was ∼0.8 and ∼1.2 at 665 K, respectively. In PbTe, transmission electron microscopic images and energy-dispersive x-ray elemental maps reveal the insertion of nanoscale precipitates induced by the GeTe alloying. Contact layers based on Au and Co-Fe were used for p- and n-type thermoelectric legs, respectively, which allow the low electrical specific contact resistances of ≤10 × 10-10 ω m2 at room temperature. Maximum thermoelectric conversion efficiency ηmax of ∼5.5% was obtained for the Cu26Cr2Ge6S32 and Pb0.98Ga0.02Te-3% GeTe-based two-pair module when the hot-side Th and cold-side Tc temperatures were maintained at 673 and 283 K, respectively. A three-dimensional finite-element simulation predicts the ηmax of ∼7.1% for the module at Th and Tc of 673 and 283 K, respectively.

Original languageEnglish
Article number013501
JournalApplied Physics Letters
Volume120
Issue number1
DOIs
Publication statusPublished - Jan 3 2022

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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