Journal ArticleDOI
Anomalously high thermoelectric figure of merit in Bi1−xSbx nanowires by carrier pocket alignment
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TLDR
In this paper, a band structure phase diagram was generated, showing the dependence of the relative band edge positions on diameter and composition, and the thermoelectric figure-of-merit (ZT) was found for p-type nanowires at 77 K for dW∼40nm and x∼0.13.Abstract:
Electronic transport calculations were carried out for Bi1−xSbx nanowires (0⩽x⩽0.30) of diameters 10 nm⩽dW⩽100 nm at 77 K. A band structure phase diagram was generated, showing the dependence of the relative band edge positions on diameter and composition. Calculations of the thermoelectric figure-of-merit (ZT) predict that the performance of Bi1−xSbx nanowires is superior to that of Bi nanowires and to that of the bulk alloy. An exceptionally high value of ZT for p-type nanowires at 77 K was found for dW∼40 nm and x∼0.13, which is explained by the coalescence in energy of up to ten valence subband edges to maximize the density-of-states at the Fermi energy.read more
Citations
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Journal ArticleDOI
New Directions for Low-Dimensional Thermoelectric Materials**
Mildred S. Dresselhaus,Gang Chen,Ming Y. Tang,Ronggui Yang,Hohyun Lee,Dezhi Wang,Zhifeng Ren,Jean-Pierre Fleurial,Pawan Gogna +8 more
TL;DR: In this article, the ability to achieve a simultaneous increase in the power factor and a decrease in the thermal conductivity of the same nanocomposite sample and for transport in the same direction is discussed.
Journal ArticleDOI
Convergence of electronic bands for high performance bulk thermoelectrics
TL;DR: It is demonstrated that it is possible to direct the convergence of many valleys in a bulk material by tuning the doping and composition, leading to an extraordinary zT value of 1.8 at about 850 kelvin.
Journal ArticleDOI
Semiconductor nanowires for energy conversion.
Allon I. Hochbaum,Peidong Yang +1 more
TL;DR: It is discovered that the thermoconductivity of the silicon nanowires can be significantly reduced due to phonon scattering, pointing to a very promising approach to design better thermoelectrical materials.
Journal ArticleDOI
Band Engineering of Thermoelectric Materials
TL;DR: This Review focuses on manipulation of the electronic and atomic structural features which makes up the thermoelectric quality factor, and the principles used are equally applicable to most good thermoeLECTric materials that could enable improvement of thermoelectedric devices from niche applications into the mainstream of energy technologies.
Journal ArticleDOI
Convergence of conduction bands as a means of enhancing thermoelectric performance of n-type Mg2Si(1-x)Sn(x) solid solutions.
TL;DR: The research suggests that striving to achieve band degeneracy by means of compositional variations is an effective strategy for enhancing the thermoelectric properties of these materials.
References
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BookDOI
CRC Handbook of Thermoelectrics
TL;DR: In this article, Rowe et al. proposed a method for reducing the thermal conductivity of a thermoelectric generator by reducing the carrier concentration of the generator, which was shown to improve the generator's performance.
Book
Semiconductor Thermoelements and Thermoelectric Cooling
A. F. Ioffe,L. S. Stil'bans,E. K. Iordanishvili,T. S. Stavitskaya,A. Gelbtuch,George Vineyard +5 more
Journal ArticleDOI
Theoretical investigation of thermoelectric transport properties of cylindrical Bi nanowires
TL;DR: In this paper, a theoretical model for the transport properties of cylindrical Bi nanowires is presented, which shows that the trigonal axis is the most favorable wire orientation for thermoelectric applications.
Journal ArticleDOI
Bismuth nanowire arrays: Synthesis and galvanomagnetic properties
Joseph P. Heremans,Christopher M. Thrush,Yu-Ming Lin,Stephen B. Cronin,Zhuomin M. Zhang,M. S. Dresselhaus,John F. Mansfield +6 more
TL;DR: In this paper, the galvanomagnetic properties of arrays of single-crystal bismuth nanowires, with diameters of 7 to 200 nm, embedded in an amorphous porous anodic alumina matrix, were reported.