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Space charge neutralization by electron-transparent suspended graphene.

Authors
  • Srisonphan, Siwapon
  • Kim, Myungji
  • Kim, Hong Koo
Type
Published Article
Journal
Scientific Reports
Publisher
Springer Nature
Publication Date
Jan 01, 2014
Volume
4
Pages
3764–3764
Identifiers
DOI: 10.1038/srep03764
PMID: 24441774
Source
Medline
License
Unknown

Abstract

Graphene possesses many fascinating properties originating from the manifold potential for interactions at electronic, atomic, or molecular levels. Here we report measurement of electron transparency and hole charge induction response of a suspended graphene anode on top of a void channel formed in a SiO2/Si substrate. A two-dimensional (2D) electron gas induced at the oxide interface emits into air and makes a ballistic transport toward the suspended graphene. A small fraction (>~0.1%) of impinging electrons are captured at the edge of 2D hole system in graphene, demonstrating good transparency to very low energy (<3 eV) electrons. The hole charges induced in the suspended graphene anode have the effect of neutralizing the electron space charge in the void channel. This charge compensation dramatically enhances 2D electron gas emission at cathode to the level far surpassing the Child-Langmuir's space-charge-limited emission.

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