Tuning the work function of graphene by ultraviolet irradiation

Yow-Jon Lin, Jian Jhou Zeng

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Graphene layers grown by chemical vapor deposition were, respectively, irradiated for 0, 20, 40, and 60 min by an ultraviolet light source in order to experimentally study the change in the work function of graphene. The dependences of the work function and carrier concentration upon ultraviolet irradiation have been found. It is shown that ultraviolet irradiation may lead to oxygen desorption, thus reducing the hole density and work function of graphene. Based on the well-known expression for the Fermi energy of Dirac fermions, the Fermi velocity of graphene was extracted to be about 5.2 × 105 m/s.

Original languageEnglish
Article number183120
JournalApplied Physics Letters
Volume102
Issue number18
DOIs
Publication statusPublished - 2013 May 6

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graphene
tuning
irradiation
ultraviolet radiation
light sources
fermions
desorption
vapor deposition
oxygen
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

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Tuning the work function of graphene by ultraviolet irradiation. / Lin, Yow-Jon; Zeng, Jian Jhou.

In: Applied Physics Letters, Vol. 102, No. 18, 183120, 06.05.2013.

Research output: Contribution to journalArticle

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AB - Graphene layers grown by chemical vapor deposition were, respectively, irradiated for 0, 20, 40, and 60 min by an ultraviolet light source in order to experimentally study the change in the work function of graphene. The dependences of the work function and carrier concentration upon ultraviolet irradiation have been found. It is shown that ultraviolet irradiation may lead to oxygen desorption, thus reducing the hole density and work function of graphene. Based on the well-known expression for the Fermi energy of Dirac fermions, the Fermi velocity of graphene was extracted to be about 5.2 × 105 m/s.

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