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Related Concept Videos

Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
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Metal-Semiconductor Junctions

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Schottky Barriers
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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Light-matter interaction in a microcavity-controlled graphene transistor.

Michael Engel1, Mathias Steiner, Antonio Lombardo

  • 1Institute of Nanotechnology, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany.

Nature Communications
|June 21, 2012
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Summary

Researchers integrated graphene transistors with optical microcavities, enhancing photocurrent generation twenty-fold. This breakthrough enables novel cavity-quantum electrodynamics studies with atomically thin graphene devices.

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Area of Science:

  • Photonics and Optoelectronics
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Graphene exhibits exceptional electronic and optical properties, making it promising for photonics and optoelectronics.
  • Existing graphene devices include photodetectors, modulators, and lasers.
  • Advanced applications require controlling light-matter interactions using photonic elements like optical cavities.

Purpose of the Study:

  • To report the first monolithic integration of a graphene transistor and a planar optical microcavity.
  • To investigate the impact of optical microcavities on graphene's optoelectronic properties.
  • To explore new avenues for nanoscale cavity-quantum electrodynamics with graphene.

Main Methods:

  • Monolithic integration of a graphene transistor with a planar optical microcavity.
  • Characterization of photocurrent generation efficiency and spectral selection.
  • Analysis of electrically excited thermal radiation.
  • Investigation of electrical transport characteristics under cavity confinement.

Main Results:

  • Demonstrated a twenty-fold enhancement in photocurrent generation.
  • Showcased microcavity-induced optical confinement controlling photocurrent efficiency and spectral selection.
  • Observed that the optical cavity influences the spectral properties of graphene's thermal radiation.
  • Found that cavity confinement modifies the electrical transport characteristics of the graphene transistor.

Conclusions:

  • The monolithic integration of graphene transistors and optical microcavities is feasible.
  • Optical microcavities significantly enhance and spectrally select photocurrent in graphene devices.
  • This work paves the way for nanoscale cavity-quantum electrodynamics using graphene as an intra-cavity medium.