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]
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 b...
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| Format: | Article |
| Language: | en_US |
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American Chemical Society
2014
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| Online Access: | http://hdl.handle.net/1721.1/86875 https://orcid.org/0000-0002-3968-8530 |
| _version_ | 1811085368929288192 |
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| author | Zhang, Qian Cao, Feng Liu, Weishu Lukas, Kevin Yu, Bo Chen, Shuo Opeil, Cyril Broido, David Chen, Gang Ren, Zhifeng |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Zhang, Qian Cao, Feng Liu, Weishu Lukas, Kevin Yu, Bo Chen, Shuo Opeil, Cyril Broido, David Chen, Gang Ren, Zhifeng |
| author_sort | Zhang, Qian |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T13:08:29Z |
| format | Article |
| id | mit-1721.1/86875 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:08:29Z |
| publishDate | 2014 |
| publisher | American Chemical Society |
| record_format | dspace |
| spelling | mit-1721.1/868752022-09-28T12:10:50Z 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] 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 Massachusetts Institute of Technology. Department of Mechanical Engineering Chen, Gang Chen, Gang 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. National Science Foundation (U.S.) (NSF grant No. 1066634) United States. Dept. of Energy (Office of Science, Office of Basic Energy Sciences, Award DE-SC0001299) Solid-State Solar-Thermal Energy Conversion Center 2014-05-08T16:27:44Z 2014-05-08T16:27:44Z 2012-06 2012-02 Article http://purl.org/eprint/type/JournalArticle 0002-7863 1520-5126 http://hdl.handle.net/1721.1/86875 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. https://orcid.org/0000-0002-3968-8530 en_US http://dx.doi.org/10.1021/ja301245b Journal of the American Chemical Society Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Chemical Society Bolin Liao |
| spellingShingle | 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 PbTe[subscript 1– y]Se[subscript y] |
| title | 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] |
| title_full | 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] |
| title_fullStr | 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] |
| title_full_unstemmed | 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] |
| title_short | 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] |
| title_sort | 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 |
| url | http://hdl.handle.net/1721.1/86875 https://orcid.org/0000-0002-3968-8530 |
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