Journal
NANO LETTERS
Volume 11, Issue 2, Pages 734-739Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl103861p
Keywords
Phonon-assisted electron emission; one-atom-thick surface; carbon nanotube; electron-phonon interaction
Categories
Funding
- NSF of China [60925003, 60771005]
- MOST [2011CB933000, 2009AA03Z315]
- MANA
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A question of how electrons can escape from one surfaces has seldom been studied and is still not properly answered. Herein, lateral electron emission from a one-atom-thick surface is thoroughly studied for the first time. We study election emission from side surface of individual electrically biased carbon nanotubes (CNTs) both experimentally and theoretically and discover a new electron emission mechanism named phonon-assisted electron emission. A kinetic model based on coupled Boltzmann equations of electrons and optical phonons is proposed, and well describes experimentally measured lateral electron emission from CNTs. It is shown that the electrons moving along biased CNT can overflow from the one-atom-thick surface due to the absorption of hot forward-scattering optical phonons. A low working voltage, high emission density, and side emission character make phonon-assisted electron emission pin:nadir promising in electron source applications.
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