Heavy Doping and Band Engineering by Potassium to Improve the Thermoelectric Figure of Merit in p-Type PbTe, PbSe, and PbTe1–ySey

Zhang, Qian; Cao, Feng; Liu, Weishu; Lukas, Kevin; Yu, Bo; Chen, Shuo; Opeil, Cyril; Broido, David; Chen, Gang; Ren, Zhifeng

doi:10.1021/ja301245b

Title: Heavy Doping and Band Engineering by Potassium to Improve the Thermoelectric Figure of Merit in p-Type PbTe, PbSe, and PbTe_1–ySe_y

Journal Article · Thu May 24 00:00:00 EDT 2012 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja301245b· OSTI ID:1386807

Zhang, Qian ^[1]; Cao, Feng ^[1]; Liu, Weishu ^[1]; Lukas, Kevin ^[1]; Yu, Bo ^[1]; Chen, Shuo ^[1]; Opeil, Cyril ^[1]; Broido, David ^[1]; Chen, Gang ^[2]; Ren, Zhifeng ^[1]

Boston College, Chestnut Hill, MA (United States). Dept. of Physics
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Mechanical Engineering

Here we present detailed studies of potassium doping in PbTe_1–ySe_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_1–ySe_y. Peak thermoelectric figure of merit (ZT) values of ~1.6 and ~1.7 were obtained for Te-rich K_0.02Pb_0.98Te_0.75Se_0.25 at 773 K and Se-rich K_0.02Pb_0.98Te_0.15Se_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_0.02Pb_0.98Te_0.75Se_0.25. Such a result is due to the improved electron transport afforded by heavy K doping with the assistance of Se.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0001299

OSTI ID:: 1386807

Journal Information:: Journal of the American Chemical Society, Vol. 134, Issue 24; ISSN 0002-7863

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Heavy Doping and Band Engineering by Potassium to Improve the Thermoelectric Figure of Merit in p-Type PbTe, PbSe, and PbTe1–ySey

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Title: Heavy Doping and Band Engineering by Potassium to Improve the Thermoelectric Figure of Merit in p-Type PbTe, PbSe, and PbTe_1–ySe_y