Crumpled Graphene Photodetector with Enhanced, Strain-Tunable, and Wavelength-Selective Photoresponsivity

Pilgyu Kang, Michael Cai Wang, Peter M. Knapp, SungWoo Nam

Research output: Contribution to journalArticlepeer-review

Abstract

A study has demonstrated that engineering the texture of graphene can enhance the optical extinction by more than an order of magnitude and therefore the photoresponsivity of a graphene-based photodetector. The textured graphene photodetector exhibited a 370% enhancement in photoresponsivity compared with a flat graphene photodetector. The photoresponsivity was modulated by about 100% as a result of a 200% applied strain, suggesting an advanced photodetector, tunable exclusively by mechanical means with potential for application to optomechanical switching systems. The study also demonstrated strain-tunable wavelength selectivity with an integrated CPC-stretchable graphene photodetector device. The novel integration has enabled selective-wavelength photodetection with a high on?off ratio of photoresponsivity. In addition to enhanced and tunable photoresponsivity, the highly flexible system has future potential for integrated biomedical optical sensing systems combined with flexible light-emitting diodes and for regulating optogenetic stimulation systems.

Original languageEnglish (US)
Pages (from-to)4639-4645
Number of pages7
JournalAdvanced Materials
Volume28
Issue number23
DOIs
StatePublished - Jan 1 2016

Keywords

  • crumpled graphene
  • photodetectors
  • photonic crystals
  • photoresponsivity
  • stretchable

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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