Journal
APPLIED PHYSICS LETTERS
Volume 112, Issue 17, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5027271
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Funding
- Centre for Advanced 2D Materials at the National University of Singapore (NRF Medium Sized Centre Programme) [R-723-000-001-281]
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The standard theory of thermionic emission developed for three-dimensional semiconductors does not apply to two-dimensional materials even for making qualitative predictions because of the vanishing out-of-plane quasiparticle velocity. This study reveals the fundamental origin of the out-of-plane charge carrier motion in a two-dimensional conductor due to the finite quasiparticle lifetime and huge uncertainty of the out-of-plane momentum. The theory is applied to a Schottky junction between graphene and a bulk semiconductor to derive a thermionic constant, which, in contrast to the conventional Richardson constant, is determined by the Schottky barrier height and Fermi level in graphene. Published by AIP Publishing.
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