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Hybrid Phonons in Nanostructures$
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Brian K. Ridley

Print publication date: 2017

Print ISBN-13: 9780198788362

Published to Oxford Scholarship Online: April 2017

DOI: 10.1093/acprof:oso/9780198788362.001.0001

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Hot Phonon Lifetime

Hot Phonon Lifetime

(p.173) 18 Hot Phonon Lifetime
Hybrid Phonons in Nanostructures

B. K. Ridley

Oxford University Press

It is well known that the performance of high-power semiconductor devices can be significantly degraded by the production of hot phonons. In III–V compounds at high electric fields, hot electrons interact strongly with polar optical phonons, with the result that the phonon population is driven far from thermodynamic equilibrium and can be described as being hot. The increase in phonon number results naturally in an increase of electrical resistance, which affects nanostructure device performance. How strong this effect is depends on the lifetime of these hot phonons. This chapter covers: phonon production rate; lifetime; decay channels; effect of confinement; and thermal conductivity—bulk modes, normal modes.

Keywords:   semiconductors, phonons, nanostructures, lifetime, thermal conductivity

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