Promising thermoelectric performance in CaAgP with intrinsic Ag vacancies

Robert J. Quinn, Jan-Willem G. Bos

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10 Citations (Scopus)
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Abstract

Semimetals have recently emerged at the forefront of contemporary thermoelectrics research. In this paper, we show that the candidate Dirac semimetal CaAgP forms with a stable CaAg0.9P composition. Intentionally, Ag-deficient CaAg0.9P shows a promising thermoelectric figure of merit, achieving zT = 0.43 at 660 K. This derives from moderate power factors, S2/ρ = 1.25 mW m-1 K-2, and a low lattice thermal conductivity, κlat = 1.2 W m-1 K-1. The thermoelectric properties of CaAg0.9P are consistent with that of a small bandgap semiconductor. High levels of doping are key to suppressing bipolar transport, enabling promising zT values, despite the low ∼0.2 eV bandgap. Unusually, the onset of bipolar transport coincides with a transition to a more electrically resistive state, indicating a fundamental change in electronic properties at high temperature.

Original languageEnglish
Article number073903
JournalApplied Physics Letters
Volume120
Issue number7
DOIs
Publication statusPublished - 14 Feb 2022

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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