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This study introduces a novel graphene-WSe2-graphene heterostructure for detecting low-energy photons. The photo-thermionic effect enables efficient detection of sub-bandgap photons, overcoming limitations of conventional semiconductor devices.

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Photonics

Background:

  • Conventional semiconductor devices face limitations in detecting low-energy photons.
  • Harnessing thermal energy from light absorption offers a promising alternative optoelectronic mechanism.
  • Key requirements include broadband absorbers with strong carrier-carrier interactions and energy-selective contacts.

Purpose of the Study:

  • To investigate the photo-thermionic effect in graphene-WSe2-graphene heterostructures for optoelectronic applications.
  • To demonstrate a device capable of detecting sub-bandgap photons.
  • To explore the potential of this heterostructure as a broadband, tunable, and ultrafast photodetector.

Main Methods:

  • Fabrication of graphene-WSe2-graphene heterostructure devices.
  • Utilizing the photo-thermionic effect for photocurrent generation.
  • Experimental characterization of device performance, including sub-bandgap photon detection and tunability.

Main Results:

  • Graphene-WSe2-graphene heterostructures exhibit the photo-thermionic effect.
  • Absorbed photon energy efficiently thermalizes in the graphene electron bath, creating a hot carrier distribution.
  • Carriers exceeding the Schottky barrier height are emitted, generating photocurrent and enabling sub-bandgap photon detection.

Conclusions:

  • The photo-thermionic effect in graphene-WSe2-graphene heterostructures provides a viable mechanism for detecting low-energy photons.
  • These devices are size-scalable, electrically tunable, broadband, and ultrafast.
  • This approach offers a promising alternative to conventional semiconductor-based photodetectors.