Thermoelectric properties of p-type cubic and rhombohedral GeTe
Abstract
Here, we investigate the electronic and thermoelectric properties of GeTe in both cubic and rhombohedral phases. We find that cubic GeTe has an electronic structure with a narrow band gap that is unfavorable at high temperature, where the cubic phase is normally stable. However, cubic GeTe has electronic features that may lead to p-type performance superior to the normal rhombohedral phase at lower temperature. This is explained in part by the combination of light and heavy band character that is very effective in obtaining high thermopower and conductivity. In addition, the valence band edge carrier pockets in cubic GeTe possess the largest anisotropy among cubic IV-VI analogs. These effects are stronger than the effect of band convergence in the rhombohedral structure. The results suggest further study of stabilized cubic GeTe as a thermoelectric.
- Authors:
-
[3];
[2]
- Jilin Univ., Changchun (China); Univ. of Missouri-Columbia, Columbia, MO (United States)
- Univ. of Missouri-Columbia, Columbia, MO (United States)
- Jilin Univ., Changchun (China)
- Publication Date:
- Research Org.:
- Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC); Univ. of Missouri, Columbia, MO (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- OSTI Identifier:
- 1439412
- Alternate Identifier(s):
- OSTI ID: 1438061
- Grant/Contract Number:
- SC0001299
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Volume: 123; Journal Issue: 19; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Thermoelectrics
Citation Formats
Xing, Guangzong, Sun, Jifeng, Li, Yuwei, Fan, Xiaofeng, Zheng, Weitao, and Singh, David J. Thermoelectric properties of p-type cubic and rhombohedral GeTe. United States: N. p., 2018.
Web. doi:10.1063/1.5025070.
Xing, Guangzong, Sun, Jifeng, Li, Yuwei, Fan, Xiaofeng, Zheng, Weitao, & Singh, David J. Thermoelectric properties of p-type cubic and rhombohedral GeTe. United States. doi:10.1063/1.5025070.
Xing, Guangzong, Sun, Jifeng, Li, Yuwei, Fan, Xiaofeng, Zheng, Weitao, and Singh, David J. Mon .
"Thermoelectric properties of p-type cubic and rhombohedral GeTe". United States. doi:10.1063/1.5025070. https://www.osti.gov/servlets/purl/1439412.
@article{osti_1439412,
title = {Thermoelectric properties of p-type cubic and rhombohedral GeTe},
author = {Xing, Guangzong and Sun, Jifeng and Li, Yuwei and Fan, Xiaofeng and Zheng, Weitao and Singh, David J.},
abstractNote = {Here, we investigate the electronic and thermoelectric properties of GeTe in both cubic and rhombohedral phases. We find that cubic GeTe has an electronic structure with a narrow band gap that is unfavorable at high temperature, where the cubic phase is normally stable. However, cubic GeTe has electronic features that may lead to p-type performance superior to the normal rhombohedral phase at lower temperature. This is explained in part by the combination of light and heavy band character that is very effective in obtaining high thermopower and conductivity. In addition, the valence band edge carrier pockets in cubic GeTe possess the largest anisotropy among cubic IV-VI analogs. These effects are stronger than the effect of band convergence in the rhombohedral structure. The results suggest further study of stabilized cubic GeTe as a thermoelectric.},
doi = {10.1063/1.5025070},
journal = {Journal of Applied Physics},
number = 19,
volume = 123,
place = {United States},
year = {2018},
month = {5}
}
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Figures / Tables:
FIG. 1: Calculated EFF (t) with respect to the carrier concentration of p-type cubic GeTe, rhombohedral GeTe, PbTe and SnTe at 600 K. Note that bipolar effect occurs below ∼1019 cm−3 for GeTe-c (shown in Fig. 4).
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