Optical Gating of Graphene on Photoconductive Fe:LiNbO3

Jon Gorecki, Vasilis Apostolopoulos, Jun Yu Ou, Sakellaris Mailis, Nikitas Papasimakis

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

We demonstrate experimentally nonvolatile, all-optical control of graphene's charge transport properties by virtue of an Fe:LiNbO3 photoconductive substrate. The substrate can register and sustain photoinduced charge distributions which modify locally the electrostatic environment of the graphene monolayer and allow spatial control of graphene resistivity. We present light-induced changes of graphene sheet resistivity as high as ∼370 ω/sq (∼2.6-fold increase) under spatially nonuniform light illumination. The light-induced modifications in the sheet resistivity are stable at room temperature but can be reversed by uniform illumination or thermal annealing (100 °C for 4 h), thus restoring graphene's electrical properties to their initial, preillumination values. The process can be subsequently repeated by further spatially nonuniform illumination.

Original languageEnglish
Pages (from-to)5940-5945
Number of pages6
JournalACS Nano
Volume12
Issue number6
DOIs
Publication statusPublished - 26 Jun 2018
Externally publishedYes

Keywords

  • field-effect
  • graphene
  • lithium niobate
  • photoconductive
  • reconfigurable electronics
  • two-dimensional materials

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