Searching for the best thermoelectrics through the optimization of transport distribution function

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	Searching for the best thermoelectrics through the optimization of transport distribution function
	Fan, Z. Y. ; Wang, H. Q. ; Zheng, J. C. ; Zheng JC(郑金成)
刊名	http://dx.doi.org/10.1063/1.3563097
	2011-04-01
关键词	FIGURE MERIT ENHANCEMENT EFFICIENCY PBTE
英文摘要	Xiamen University of China; Specialized Research Fund for the Doctoral Program of Higher Education [20090121120028, 20100121120026]; National Natural Science Foundation of China [11044001]; Natural Science Foundation of Fujian Province, China [2009J01015,; The thermoelectric performance of materials is dependent on the interplay or competition among three key components, the electrical conductivity, thermopower, and thermal conductivity, which can be written as integrals of a single function, the transport distribution function (TDF). Mahan and Sofo [Proc. Natl. Acad. Sci. USA 93, 7436 (1996)] found that, mathematically, the thermoelectric properties could be maximized by a delta-shaped transport distribution, which was associated with a narrow distribution of the energy of the electrons participating in the transport process. In this work, we revisited the shape effect of TDF on thermoelectric figure of merit. It is confirmed both heuristically and numerically that among all the normalized TDF the Dirac delta function leads to the largest thermoelectric figure of merit. Whereas, for the case of TDF being bounded, a rectangular-shape distribution is instead found to be the most favorable one, which could be achieved through nanoroute. Our results also indicate that high thermoelectric figure of merit is associated with appropriate violations of the Wiedemann Franz law. (C) 2011 American Institute of Physics. [doi:10.1063/1.3563097]
语种	英语
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/69949]
专题	物理技术－已发表论文
推荐引用方式 GB/T 7714	Fan, Z. Y.,Wang, H. Q.,Zheng, J. C.,et al. Searching for the best thermoelectrics through the optimization of transport distribution function[J]. http://dx.doi.org/10.1063/1.3563097,2011.
APA	Fan, Z. Y.,Wang, H. Q.,Zheng, J. C.,&郑金成.(2011).Searching for the best thermoelectrics through the optimization of transport distribution function.http://dx.doi.org/10.1063/1.3563097.
MLA	Fan, Z. Y.,et al."Searching for the best thermoelectrics through the optimization of transport distribution function".http://dx.doi.org/10.1063/1.3563097 (2011).