title: Effects of plasmonic coupling and electrical current on persistent photoconductivity of single-layer graphene on pristine and silver-nanoparticle-coated SiO2/Si.
abstract: Effects and mechanisms of conductivity variation of chemically vapor deposited single-layer graphene covering silver nanoparticles on SiO(2)/Si are reported based on blue-light (405 nm) 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 10 mV applied voltage, negative photoconductivity persists for hours. In comparison, negative photoconductivity of graphene on pristine SiO(2)/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.
authors.affiliation: Advanced Optoelectronic Technology Center, National Cheng Kung University, No1, University Road, Tainan 701, Taiwan.
authors.forename: Chih-Yi
authors.initials: CY
authors.lastname: Liu
authors.forename: Kengchih
authors.initials: K
authors.lastname: Liang
authors.forename: Chun-Cheng
authors.initials: CC
authors.lastname: Chang
authors.forename: Yonhua
authors.initials: Y
authors.lastname: Tzeng
mesh_terms: D000327:Adsorption; D004553:Electric Conductivity; D004574:Electromagnetic Fields; D006108:Graphite / Q000737:chemistry* / Q000528:radiation effects*; D008027:Light; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D012825:Silicon / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D020349:Surface Plasmon Resonance / Q000379:methods*
chemical_list: D012822:Silicon Dioxide; D006108:Graphite; D012825:Silicon