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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 20 — Sep. 24, 2012
  • pp: 22943–22952

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

Chih-Yi Liu, Kengchih Liang, Chun-Cheng Chang, and Yonhua Tzeng  »View Author Affiliations

Optics Express, Vol. 20, Issue 20, pp. 22943-22952 (2012)

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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.

© 2012 OSA

OCIS Codes
(230.0250) Optical devices : Optoelectronics
(240.6680) Optics at surfaces : Surface plasmons
(260.5150) Physical optics : Photoconductivity
(220.4241) Optical design and fabrication : Nanostructure fabrication
(250.5403) Optoelectronics : Plasmonics
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Optics at Surfaces

Original Manuscript: July 30, 2012
Revised Manuscript: September 9, 2012
Manuscript Accepted: September 13, 2012
Published: September 21, 2012

Chih-Yi Liu, Kengchih Liang, Chun-Cheng Chang, and Yonhua Tzeng, "Effects of plasmonic coupling and electrical current on persistent photoconductivity of single-layer graphene on pristine and silver-nanoparticle-coated SiO2/Si," Opt. Express 20, 22943-22952 (2012)

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