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:
-
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Fordham Univ., Bronx, NY (United States)
- 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.
Roslyak, Oleksiy, & Piryatinski, Andrei. Thermoelectric properties of semiconductor nanowire networks. United States. https://doi.org/10.1063/1.4944715
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.
@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}
}
Web of Science
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