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Title: Thermoelectric properties of semiconductor nanowire networks

Abstract

To examine the thermoelectric (TE) properties of a semiconductor nanowire (NW) network, we propose a theoretical approach mapping the TE network on a two-port network. In contrast to a conventional single-port (i.e., resistor)network model, our model allows for large scale calculations showing convergence of TE figure of merit, ZT, with an increasing number of junctions. Using this model, numerical simulations are performed for the Bi2Te3 branched nanowire (BNW) and Cayley tree NW (CTNW) network. We find that the phonon scattering at the network junctions plays a dominant role in enhancing the network ZT. Specifically, disordered BNW and CTNW demonstrate an order of magnitude higher ZT enhancement compared to their ordered counterparts. Formation of preferential TE pathways in CTNW makes the network effectively behave as its BNW counterpart. In conclusion, we provide formalism for simulating large scale nanowire networks hinged upon experimentally measurable TE parameters of a single T-junction.

Authors:
 [1];  [2]
+ Show Author Affiliations
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Fordham Univ., Bronx, NY (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1304836
Alternate Identifier(s):
OSTI ID: 1421091
Report Number(s):
LA-UR-16-22271
Journal ID: ISSN 0021-8979; JAPIAU
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 119; Journal Issue: 12; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; material science; semiconductor nano-wires; nanowire networks; thermoelectric materials; phonons; thermal conductivity; resistors

Citation Formats

Roslyak, Oleksiy, and Piryatinski, Andrei. Thermoelectric properties of semiconductor nanowire networks. United States: N. p., 2016. Web. doi:10.1063/1.4944715.
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Roslyak, Oleksiy, & Piryatinski, Andrei. Thermoelectric properties of semiconductor nanowire networks. United States. https://doi.org/10.1063/1.4944715
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Roslyak, Oleksiy, and Piryatinski, Andrei. Mon . "Thermoelectric properties of semiconductor nanowire networks". United States. https://doi.org/10.1063/1.4944715. https://www.osti.gov/servlets/purl/1304836.
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@article{osti_1304836,
title = {Thermoelectric properties of semiconductor nanowire networks},
author = {Roslyak, Oleksiy and Piryatinski, Andrei},
abstractNote = {To examine the thermoelectric (TE) properties of a semiconductor nanowire (NW) network, we propose a theoretical approach mapping the TE network on a two-port network. In contrast to a conventional single-port (i.e., resistor)network model, our model allows for large scale calculations showing convergence of TE figure of merit, ZT, with an increasing number of junctions. Using this model, numerical simulations are performed for the Bi2Te3 branched nanowire (BNW) and Cayley tree NW (CTNW) network. We find that the phonon scattering at the network junctions plays a dominant role in enhancing the network ZT. Specifically, disordered BNW and CTNW demonstrate an order of magnitude higher ZT enhancement compared to their ordered counterparts. Formation of preferential TE pathways in CTNW makes the network effectively behave as its BNW counterpart. In conclusion, we provide formalism for simulating large scale nanowire networks hinged upon experimentally measurable TE parameters of a single T-junction.},
doi = {10.1063/1.4944715},
journal = {Journal of Applied Physics},
number = 12,
volume = 119,
place = {United States},
year = {Mon Mar 28 00:00:00 EDT 2016},
month = {Mon Mar 28 00:00:00 EDT 2016}
}
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https://doi.org/10.1063/1.4944715
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