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Engineering enhanced thermoelectric properties in zigzag graphene nanoribbons

Karamitaheri, H ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1063/1.3688034
  3. Publisher: 2012
  4. Abstract:
  5. We theoretically investigate the thermoelectric properties of zigzag graphene nanoribbons in the presence of extended line defects, substrate impurities, and edge roughness along the nanoribbon's length. A nearest-neighbor tight-binding model for the electronic structure and a fourth nearest-neighbor force constant model for the phonon bandstructure are used. For transport, we employ quantum mechanical non-equilibrium Green's function simulations. Starting from the pristine zigzag nanoribbon structure that exhibits very poor thermoelectric performance, we demonstrate how after a series of engineering design steps the performance can be largely enhanced. Our results could be useful in the design of highly efficient nanostructured graphene nanoribbon-based thermoelectric devices
  6. Keywords:
  7. Edge roughness ; Engineering design ; Force constant models ; Graphene nanoribbons ; Line defects ; Nano-structured ; Nanoribbon structures ; Nanoribbons ; Nearest-neighbors ; Non-equilibrium Green's function ; Quantum mechanical ; Thermoelectric devices ; Thermoelectric performance ; Thermoelectric properties ; Tight binding model ; Electronic structure ; Graphene ; Quantum theory ; Thermoelectric equipment ; Thermoelectricity ; Nanostructures
  8. Source: Journal of Applied Physics ; Volume 111, Issue 5 , 2012 ; 00218979 (ISSN)
  9. URL: http://scitation.aip.org/content/aip/journal/jap/111/5/10.1063/1.3688034