CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Impact of coupling geometry on thermoelectric properties of oligophenyl-base transistor |
S Ramezani Akbarabadi, H Rahimpour Soleimani, M Bagheri Tagani, Z Golsanamlou |
Computational Nanophysics Laboratory(CNL), Department of Physics, University of Guilan, Rasht, P. O. Box 41335-1914, Iran |
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Abstract Thermal and electron transport through organic molecules attached to three-dimensional gold electrodes in two different configurations, namely para and meta with thiol-terminated junctions is studied theoretically in the linear response regime using Green's function formalism. We used thiol-terminated (-SH bond) benzene units and found a positive thermopower because the highest occupied molecular orbital (HOMO) is near the Fermi energy level. We investigated the influence of molecular length and molecular junction geometry on the thermoelectric properties. Our results show that the thermoelectric properties are highly sensitive to the coupling geometry and the molecular length. In addition, we observed that the interference effects and increasing molecular length can increase the thermoelectric efficiency of device in a specific configuration.
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Received: 23 June 2016
Revised: 03 November 2016
Accepted manuscript online:
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PACS:
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73.50.Lw
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(Thermoelectric effects)
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84.60.Bk
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(Performance characteristics of energy conversion systems; figure of merit)
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85.80.Fi
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(Thermoelectric devices)
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Corresponding Authors:
H Rahimpour Soleimani
E-mail: rahimpour@guilan.ac.ir
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Cite this article:
S Ramezani Akbarabadi, H Rahimpour Soleimani, M Bagheri Tagani, Z Golsanamlou Impact of coupling geometry on thermoelectric properties of oligophenyl-base transistor 2017 Chin. Phys. B 26 027303
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