Effects of plasmonic coupling and electrical current on persistent photoconductivity of single-layer graphene on pristine and silvernanoparticle- coated SiO2/Si

Chih Yi Liu, Kengchih Liang, C. C. Chang, Yon-Hua Tzeng

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Effects and mechanisms of conductivity variation of chemically vapor deposited single-layer graphene covering silver nanoparticles on SiO2/Si are reported based on blue-light (405nm) induced plasmonic coupling and electrical current induced annealing and desorption of surface adsorbates. With 1V applied voltage, photoconductivity is positive except a brief negative period when the graphene is first illuminated by light. At 10mV applied voltage, negative photoconductivity persists for hours. In comparison, negative photoconductivity of graphene on pristine SiO2/Si persists for tens of hours. When the applied voltage is increased to 1V, it takes tens of hours of light illumination to change to positive photoconductivity.

Original languageEnglish
Pages (from-to)22943-22952
Number of pages10
JournalOptics Express
Volume20
Issue number20
DOIs
Publication statusPublished - 2012 Sep 24

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photoconductivity
graphene
electric potential
coverings
desorption
illumination
silver
vapors
conductivity
nanoparticles
annealing

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

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title = "Effects of plasmonic coupling and electrical current on persistent photoconductivity of single-layer graphene on pristine and silvernanoparticle- coated SiO2/Si",
abstract = "Effects and mechanisms of conductivity variation of chemically vapor deposited single-layer graphene covering silver nanoparticles on SiO2/Si are reported based on blue-light (405nm) induced plasmonic coupling and electrical current induced annealing and desorption of surface adsorbates. With 1V applied voltage, photoconductivity is positive except a brief negative period when the graphene is first illuminated by light. At 10mV applied voltage, negative photoconductivity persists for hours. In comparison, negative photoconductivity of graphene on pristine SiO2/Si persists for tens of hours. When the applied voltage is increased to 1V, it takes tens of hours of light illumination to change to positive photoconductivity.",
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Effects of plasmonic coupling and electrical current on persistent photoconductivity of single-layer graphene on pristine and silvernanoparticle- coated SiO2/Si. / Liu, Chih Yi; Liang, Kengchih; Chang, C. C.; Tzeng, Yon-Hua.

In: Optics Express, Vol. 20, No. 20, 24.09.2012, p. 22943-22952.

Research output: Contribution to journalArticle

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