Journal
ACS APPLIED ENERGY MATERIALS
Volume 2, Issue 4, Pages 2596-2603Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b02213
Keywords
thermoelectric materials; Cu/Sb codoped GeTe; Seebeck coefficient; zT value; carrier concentration; ultralow lattice thermal conductivity; multiscatter mechanism
Funding
- Natural Science Foundation of China [51871240]
- National Postdoctoral Program for Innovative Talents [BX201700132]
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Pristine GeTe shows promising thermoelectric performance but is limited by the high carrier concentration (n(H)) from Ge vacancies and thermal conductivity. Herein, Cu/Sb was chosen as codopants to suppress the high n(H) and to decrease thermal conductivity. In this condition, a promising zT of , similar to 1.62 under 773 K was acquired in the Ge-0.85 Te(CuSb)(0.075) system proposed in this paper/work. Results show that as the dopant concentration increases, the power factor rises due to the reduction of the n(H) to similar to 1 x 10(20) cm(-3). Apart from this, the total thermal conductivity also declines from similar to 7.4 W m(-1) K-1 to similar to 1.59 W m(-1) originating from an ultralow lattice thermal conductivity, in which the multiscatter mechanism from grain boundaries and point defect disperses the frequency phonons differently. The findings in this paper combine thermal and electronic strategies and lay the foundation to develop Pb-free thermoelectric materials.
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