Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.3531573
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dc.titleA nonequilibrium Green's function study of thermoelectric properties in single-walled carbon nanotubes
dc.contributor.authorJiang, J.-W.
dc.contributor.authorWang, J.-S.
dc.contributor.authorLi, B.
dc.date.accessioned2014-10-16T09:14:16Z
dc.date.available2014-10-16T09:14:16Z
dc.date.issued2011-01-01
dc.identifier.citationJiang, J.-W., Wang, J.-S., Li, B. (2011-01-01). A nonequilibrium Green's function study of thermoelectric properties in single-walled carbon nanotubes. Journal of Applied Physics 109 (1) : -. ScholarBank@NUS Repository. https://doi.org/10.1063/1.3531573
dc.identifier.issn00218979
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/95655
dc.description.abstractThe phonon and electron transport in single-walled carbon nanotubes (SWCNT) are investigated using the nonequilibrium Green's function approach. In zigzag SWCNT (n,0) with mod(n,3)≠0, the thermal conductance is mainly attributed to the phonon transport, while the electron only has few percentage contribution. The maximum value of the figure of merit (ZT) is about 0.2 in this type of SWCNT. The ZT is considerably larger in narrower SWCNT because of enhanced Seebeck coefficient. ZT is smaller in the armchair SWCNT, where Seebeck coefficient is small due to zero band gap. It is found that the cluster isotopic doping can reduce the phonon thermal conductance obviously and enhance the value of ZT. The uniaxial elongation and compress strain depresses phonons in whole frequency region, leading to the reduction in the phonon thermal conductance in whole temperature range. Interestingly, the elongation strain can affect the phonon transport more seriously than the compress strain, because the high frequency G mode is completely filtered out under elongation strain €>0.05. The strain also has important effect on the subband edges of the electron band structure by smoothing the steps in the electron transmission function. The ZT is decreased by strain as the reduction in the electronic conductance overcomes the reduction in the thermal conductance. © 2011 American Institute of Physics.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1063/1.3531573
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentPHYSICS
dc.description.doi10.1063/1.3531573
dc.description.sourcetitleJournal of Applied Physics
dc.description.volume109
dc.description.issue1
dc.description.page-
dc.description.codenJAPIA
dc.identifier.isiut000286219300132
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