Thermal anisotropy enhanced by phonon size effects in nanoporous materials

Romano, Giuseppe; Kolpak, Alexie M.

doi:10.1063/1.4976540

Thermal anisotropy enhanced by phonon size effects in nanoporous materials

Journal Article · Sun Feb 26 23:00:00 EST 2017 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4976540· OSTI ID:1466007

Romano, Giuseppe ^[1]; Kolpak, Alexie M. ^[2]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Massachusetts Institute of Technology
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

While thermal anisotropy is a desirable materials property for many applications, including transverse thermoelectrics and thermal management in electronic devices, it remains elusive in practical natural compounds. In this work, we show how nanoporous materials with anisotropic pore lattices can be used as a platform for inducing strong heat transport directionality in isotropic materials. Using density functional theory and the phonon Boltzmann transport equation, we calculate the phonon-size effects and thermal conductivity of nanoporous silicon with different anisotropic pore lattices. Here, our calculations predict a strong directionality in the thermal conductivity, dictated by the difference in the pore-pore distances, i.e., the phonon bottleneck, along the two Cartesian axes. Using Fourier’s law, we also compute the diffusive heat transport for the same geometries obtaining significantly smaller anisotropy, revealing the crucial role of phonon-size effects in tuning thermal transport directionality. Besides enhancing our understanding of nanoscale heat transport, our results demonstrate the promise of nanoporous materials for modulating anisotropy in thermal conductivity.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0001299

OSTI ID:: 1466007

Alternate ID(s):: OSTI ID: 1348268

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 9 Vol. 110; ISSN 0003-6951

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

Country of Publication:: United States

Language:: English

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