Toward reversing Joule heating with a phonon-absorbing heterobarrier

Shin, Seungha; Kaviany, Massoud

doi:10.1103/PhysRevB.91.085301

Title: Toward reversing Joule heating with a phonon-absorbing heterobarrier

Journal Article · Mon Feb 02 00:00:00 EST 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.91.085301· OSTI ID:1370116

Shin, Seungha ^[1]; Kaviany, Massoud ^[2]

Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Michigan, Ann Arbor, MI (United States)

Using a graded heterobarrier placed along an electron channel, phonons emitted in Joule heating are recycled in situ by increasing the entropy of phonon-absorbing electrons. The asymmetric electric potential distribution created by alloy grading separates the phonon absorption and emission regions, and emission in the larger effective-mass region causes momentum relaxation with smaller electron kinetic energy loss. These lead to smaller overall phonon emission and simultaneous potential-gain and self-cooling effects. Larger potential is gained with lower current and higher optical-phonon temperature. The self-consistent Monte Carlo simulations complying with the lateral momentum conservation combined with the entropy analysis are applied to a GaAs:Al electron channel with a graded heterobarrier, and under ideal lateral thermal isolation from surroundings, the phonon recycling efficiency reaches 25% of the reversible limit at 350 K, and it increases with temperature. In conclusion, the lateral momentum contributes to the transmission across the barrier, so partially nonconserving lateral momentum electron scattering (rough interface) can improve efficiency.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Solar and Thermal Energy Conversion (CSTEC)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)

Grant/Contract Number:: SC0000957; CBET 1332807; AC02-05CH11231

OSTI ID:: 1370116

Alternate ID(s):: OSTI ID: 1181577

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 91, Issue 8; Related Information: CSTEC partners with University of Michigan (lead); Kent State University; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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