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)
