Heavy Doping and Band Engineering by Potassium to Improve the Thermoelectric Figure of Merit in p-Type PbTe, PbSe, and PbTe1–ySey
Abstract
Here we present detailed studies of potassium doping in PbTe1–ySey (y = 0, 0.15, 0.25, 0.75, 0.85, 0.95, and 1). It was found that Se increases the doping concentration of K in PbTe as a result of the balance of electronegativity and also lowers the lattice thermal conductivity because of the increased number of point defects. Tuning the composition and carrier concentration to increase the density of states around the Fermi level results in higher Seebeck coefficients for the two valence bands of PbTe1–ySey. Peak thermoelectric figure of merit (ZT) values of ~1.6 and ~1.7 were obtained for Te-rich K0.02Pb0.98Te0.75Se0.25 at 773 K and Se-rich K0.02Pb0.98Te0.15Se0.85 at 873 K, respectively. However, the average ZT was higher in Te-rich compositions than in Se-rich compositions, with the best found in K0.02Pb0.98Te0.75Se0.25. Such a result is due to the improved electron transport afforded by heavy K doping with the assistance of Se.
- Authors:
-
- Boston College, Chestnut Hill, MA (United States). Dept. of Physics
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Mechanical Engineering
- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1386807
- Grant/Contract Number:
- SC0001299
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the American Chemical Society
- Additional Journal Information:
- Journal Volume: 134; Journal Issue: 24; Journal ID: ISSN 0002-7863
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Zhang, Qian, Cao, Feng, Liu, Weishu, Lukas, Kevin, Yu, Bo, Chen, Shuo, Opeil, Cyril, Broido, David, Chen, Gang, and Ren, Zhifeng. Heavy Doping and Band Engineering by Potassium to Improve the Thermoelectric Figure of Merit in p-Type PbTe, PbSe, and PbTe1–ySey. United States: N. p., 2012.
Web. doi:10.1021/ja301245b.
Zhang, Qian, Cao, Feng, Liu, Weishu, Lukas, Kevin, Yu, Bo, Chen, Shuo, Opeil, Cyril, Broido, David, Chen, Gang, & Ren, Zhifeng. Heavy Doping and Band Engineering by Potassium to Improve the Thermoelectric Figure of Merit in p-Type PbTe, PbSe, and PbTe1–ySey. United States. https://doi.org/10.1021/ja301245b
Zhang, Qian, Cao, Feng, Liu, Weishu, Lukas, Kevin, Yu, Bo, Chen, Shuo, Opeil, Cyril, Broido, David, Chen, Gang, and Ren, Zhifeng. Thu .
"Heavy Doping and Band Engineering by Potassium to Improve the Thermoelectric Figure of Merit in p-Type PbTe, PbSe, and PbTe1–ySey". United States. https://doi.org/10.1021/ja301245b. https://www.osti.gov/servlets/purl/1386807.
@article{osti_1386807,
title = {Heavy Doping and Band Engineering by Potassium to Improve the Thermoelectric Figure of Merit in p-Type PbTe, PbSe, and PbTe1–ySey},
author = {Zhang, Qian and Cao, Feng and Liu, Weishu and Lukas, Kevin and Yu, Bo and Chen, Shuo and Opeil, Cyril and Broido, David and Chen, Gang and Ren, Zhifeng},
abstractNote = {Here we present detailed studies of potassium doping in PbTe1–ySey (y = 0, 0.15, 0.25, 0.75, 0.85, 0.95, and 1). It was found that Se increases the doping concentration of K in PbTe as a result of the balance of electronegativity and also lowers the lattice thermal conductivity because of the increased number of point defects. Tuning the composition and carrier concentration to increase the density of states around the Fermi level results in higher Seebeck coefficients for the two valence bands of PbTe1–ySey. Peak thermoelectric figure of merit (ZT) values of ~1.6 and ~1.7 were obtained for Te-rich K0.02Pb0.98Te0.75Se0.25 at 773 K and Se-rich K0.02Pb0.98Te0.15Se0.85 at 873 K, respectively. However, the average ZT was higher in Te-rich compositions than in Se-rich compositions, with the best found in K0.02Pb0.98Te0.75Se0.25. Such a result is due to the improved electron transport afforded by heavy K doping with the assistance of Se.},
doi = {10.1021/ja301245b},
journal = {Journal of the American Chemical Society},
number = 24,
volume = 134,
place = {United States},
year = {Thu May 24 00:00:00 EDT 2012},
month = {Thu May 24 00:00:00 EDT 2012}
}
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