Publication Date

5-7-2020

Department

Ames Laboratory; Chemistry

Campus Units

Ames Laboratory, Chemistry

OSTI ID+

1617469

Report Number

IS-J 10213

DOI

10.1021/acsaem.0c00565

Journal Title

ACS Applied Energy Materials

Abstract

Bulk GeAs2 was synthesized utilizing a vapor transport reaction with iodine. Thermal stability tests under dynamic conditions show that GeAs2 decomposes below 700 K, in contrast to the reported congruent melting at 1029 K measured at saturated As vapor pressure. GeAs2 is a p-type narrow bandgap (∼0.4 eV) semiconductor. From a thermoelectric standpoint, GeAs2 outperforms previous computational predictions in thermopower and thermal conductivity. However, electrical resistivity is significantly higher than predicted values, resulting in the low overall thermoelectric figure of merit. Aliovalent doping strategies for GeAs2 should be developed to achieve reasonable thermoelectric performance.

DOE Contract Number(s)

AC02-07CH11358

Language

en

Publisher

Iowa State University Digital Repository, Ames IA (United States)

Available for download on Friday, May 07, 2021

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