Alloying and Doping Control in the Layered Metal Phosphide Thermoelectric CaCuP.

ABSTRACT: We recently identified CaCuP as a potential low cost, low density thermoelectric material, achieving zT = 0.5 at 792 K. Its performance is limited by a large lattice thermal conductivity, κ_L, and by intrinsically large p-type doping levels. In this paper, we address the thermal and electronic tunability of CaCuP. Isovalent alloying with As is possible over the full solid solution range in the CaCuP_1-xAs_x series. This leads to a reduction in κ_L due to mass fluctuations but also to a detrimental increase in p-type doping due to increasing Cu vacancies, which prevents zT improvement. Phase boundary mapping, exploiting small deviations from 1:1:1 stoichiometry, was used to explore doping tunabil

SUBMITTER: Quinn RJ 

PROVIDER: S-EPMC11137819 | biostudies-literature | 2024 May

REPOSITORIES: biostudies-literature