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

9 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

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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