Heavy Doping and Band Engineering by Potassium to Improve the Thermoelectric Figure of Merit in p-Type PbTe, PbSe, and PbTe[subscript 1– y]Se[subscript y]
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Paper4_Q.Zhang_JACS.pdf
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Author(s)
Zhang, Qian
Cao, Feng
Liu, Weishu
Lukas, Kevin
Yu, Bo
Chen, Shuo
Opeil, Cyril
Broido, David
Chen, Gang
Ren, Zhifeng
Alternative Title
Heavy Doping and Band Engineering by Potassium to Improve the Thermoelectric Figure of Merit in p-Type PbTe, PbSe, and PbTe1–ySey
Date Issued
June 2012
Journal
Journal of the American Chemical Society
Publisher
American Chemical Society
Citation
Zhang, Qian, Feng Cao, Weishu Liu, Kevin Lukas, Bo Yu, Shuo Chen, Cyril Opeil, David Broido, Gang Chen, and Zhifeng Ren. “ Heavy Doping and Band Engineering by Potassium to Improve the Thermoelectric Figure of Merit in p-Type PbTe, PbSe, and PbTe[subscript 1– y]Se[subscript y].” Journal of the American Chemical Society 134, no. 24 (June 20, 2012): 10031–10038.
Version
Author's final manuscript
Abstract
We present detailed studies of potassium doping in PbTe[subscript 1– y]Se[subscript y] (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 PbTe[subscript 1– y]Se[subscript y]. Peak thermoelectric figure of merit (ZT) values of 1.6 and 1.7 were obtained for Te-rich K[subscript 0.02]Pb[subscript 0.98]Te[subscript 0.75]Se[subscript 0.25] at 773 K and Se-rich K[subscript 0.02]Pb[subscript 0.98]Te[subscript 0.15]Se[subscript 0.85] at 873 K, respectively. However, the average ZT was higher in Te-rich compositions than in Se-rich compositions, with the best found in K[subscript 0.02]Pb[subscript 0.98]Te[subscript 0.75]Se[subscript 0.25]. Such a result is due to the improved electron transport afforded by heavy K doping with the assistance of Se.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1021/ja301245b
