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Optically-Thin Broadband Graphene-Membrane Photodetector.

Tania Moein1,2, Darius Gailevičius3, Tomas Katkus1,2

  • 1Optical Sciences Centre, Swinburne University of Technology, John St., Hawthorn, VIC 3122, Australia.

Nanomaterials (Basel, Switzerland)
|February 29, 2020
PubMed
Summary
This summary is machine-generated.

A new graphene-on-silicon nitride photodetector efficiently detects visible-IR light. Its design minimizes optical loss, making it ideal for 3D optical elements and wearable electronics.

Keywords:
Si3N4 membranegrapheneoptically thin photodetectorthermopower

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Area of Science:

  • Optoelectronics
  • Materials Science

Background:

  • Photodetectors are crucial components in optical systems.
  • Graphene's unique electronic properties offer potential for advanced photodetector designs.
  • Integrating photodetectors into 3D optical elements requires minimizing optical losses.

Purpose of the Study:

  • To develop a broadband graphene-on-silicon nitride photodetector.
  • To investigate the device's performance in the visible-IR spectral range.
  • To explore its potential applications in 3D optical elements and wearable devices.

Main Methods:

  • Fabrication using simple lithography and deposition techniques.
  • Characterization of photo-current generation due to built-in potential from dissimilar metal electrodes on graphene.
  • Sensitivity measurements at 515 nm and 1030 nm wavelengths.

Main Results:

  • A broadband graphene-on-Si3N4-membrane photodetector was successfully realized.
  • The photodetector exhibits a sensitivity of approximately 1.1 μA/W.
  • Reduced separation between metal contacts enhances the built-in electric field gradient and charge separation efficiency.

Conclusions:

  • The developed photodetector is optically thin and suitable for integration into 3D optical systems.
  • Its design minimizes optical losses, enabling applications in photonic crystals, sensors, and wearable electronics.