Thermoelectric properties of semiconductor nanowire networks

Roslyak, Oleksiy; Piryatinski, Andrei

doi:10.1063/1.4944715

Title: Thermoelectric properties of semiconductor nanowire networks

Journal Article · Mon Mar 28 00:00:00 EDT 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4944715· OSTI ID:1304836

Roslyak, Oleksiy ^[1]; Piryatinski, Andrei ^[2]

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)

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.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1304836

Alternate ID(s):: OSTI ID: 1421091

Report Number(s):: LA-UR-16-22271; JAPIAU

Journal Information:: Journal of Applied Physics, Vol. 119, Issue 12; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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