Thermal investigation of nanostructured bulk thermoelectric materials with hierarchical structures: An effective medium approach

Qing Hao, Hongbo Zhao, Yue Xiao, Dongchao Xu

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

In recent years, hierarchical structures have been intensively studied as an effective approach to tailor the electron and phonon transport inside a bulk material for thermoelectric applications. With atomic defects and nano- to micro-scale structures in a bulk material, the lattice thermal conductivity can be effectively suppressed across the whole phonon spectrum, while maintaining or somewhat enhancing the electrical properties. For general materials with superior electrical properties, high thermoelectric performance can be achieved using hierarchical structures to minimize the lattice thermal conductivity. Despite many encouraging experimental results, accurate lattice thermal conductivity predictions are still challenging for a bulk material with hierarchical structures. In this work, an effective medium formulation is developed for nanograined bulk materials with embedded nanostructures for frequency-dependent phonon transport analysis. This new formulation is validated with frequency-dependent phonon Monte Carlo simulations. For high-temperature thermoelectric applications, nanograined bulk ZnO with embedded GaN nanoparticles is studied with the formulation.

Original languageEnglish (US)
Article number014303
JournalJournal of Applied Physics
Volume123
Issue number1
DOIs
StatePublished - Jan 7 2018

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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