Concept of infrared photodetector based on graphene-graphene nanoribbon structure

Victor Ryzhii, Taiichi Otsuji, Nadezhda Ryabova, Maxim Ryzhii, Vladimir Mitin, Valeriy Karasik

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


We study the mechanisms of photoconductivity in graphene layer-graphene nanoribbon-graphene layer (GL-GNR-GL) structures with the i-type gapless GL layers as sensitive elements and I-type GNRs as barrier elements. The effects of both an increase in the electron and hole densities under infrared illumination and the electron and hole heating and cooling in GLs are considered. The device model for a GL-GNR-GL photodiode is developed. Using this model, the dark current, photocurrent, and responsivity are calculated as functions of the structure parameters, temperature, and the photon energy. The transition from heating of the electron-hole plasma in GLs to its cooling by changing the incident photon energy can result in the change of the photoconductivity sign from positive to negative. It is demonstrated that GL-GNR-GL photodiodes can be used in effective infrared and terahertz detectors operating at room temperature. The change in the photoconductivity sign can be used for the discrimination of the incident radiation with the wavelength 2-3 μm and 8-12 μm.

Original languageEnglish
Pages (from-to)137-141
Number of pages5
JournalInfrared Physics and Technology
Publication statusPublished - 2013


  • Dark current
  • Graphene
  • Graphene nanoribbon
  • Infrared detector
  • Photocurrent

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics


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