Toward reversing Joule heating with a phonon-absorbing heterobarrier
Abstract
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.
- Authors:
-
- Univ. of Tennessee, Knoxville, TN (United States)
- Univ. of Michigan, Ann Arbor, MI (United States)
- Publication Date:
- Research Org.:
- Energy Frontier Research Centers (EFRC) (United States). Center for Solar and Thermal Energy Conversion (CSTEC)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
- OSTI Identifier:
- 1370116
- Alternate Identifier(s):
- OSTI ID: 1181577
- Grant/Contract Number:
- SC0000957; CBET 1332807; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B, Condensed Matter and Materials Physics
- Additional Journal Information:
- Journal Volume: 91; Journal Issue: 8; Related Information: CSTEC partners with University of Michigan (lead); Kent State University; Journal ID: ISSN 1098-0121
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING
Citation Formats
Shin, Seungha, and Kaviany, Massoud. Toward reversing Joule heating with a phonon-absorbing heterobarrier. United States: N. p., 2015.
Web. doi:10.1103/PhysRevB.91.085301.
Shin, Seungha, & Kaviany, Massoud. Toward reversing Joule heating with a phonon-absorbing heterobarrier. United States. https://doi.org/10.1103/PhysRevB.91.085301
Shin, Seungha, and Kaviany, Massoud. Mon .
"Toward reversing Joule heating with a phonon-absorbing heterobarrier". United States. https://doi.org/10.1103/PhysRevB.91.085301. https://www.osti.gov/servlets/purl/1370116.
@article{osti_1370116,
title = {Toward reversing Joule heating with a phonon-absorbing heterobarrier},
author = {Shin, Seungha and Kaviany, Massoud},
abstractNote = {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.},
doi = {10.1103/PhysRevB.91.085301},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 8,
volume = 91,
place = {United States},
year = {Mon Feb 02 00:00:00 EST 2015},
month = {Mon Feb 02 00:00:00 EST 2015}
}
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