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Related Concept Videos

P-N junction01:11

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...

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Related Experiment Video

Updated: Jun 8, 2026

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Published on: July 24, 2015

Controllable p-n junction formation in monolayer graphene using electrostatic substrate engineering.

Hsin-Ying Chiu1, Vasili Perebeinos, Yu-Ming Lin

  • 1IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598, United States. hchiu@us.ibm.com

Nano Letters
|October 5, 2010
PubMed
Summary
This summary is machine-generated.

Researchers created novel p-n junctions in graphene using substrate modification, not extra gates. This method allows controlled formation of sharp junctions for advanced electronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Graphene doping typically requires multiple electrostatic gates or charge transfer from adsorbates.
  • Existing methods for creating p-n junctions in graphene can be complex and less controllable.

Purpose of the Study:

  • To demonstrate a new method for forming p-n junctions in graphene.
  • To investigate electric transport in graphene at high fields.
  • To achieve controllable junction formation without additional gating structures.

Main Methods:

  • Investigating electric transport in graphene on silicon dioxide (SiO2) substrates.
  • Modifying the local electrostatic potential of the substrate near contacts.
  • Analyzing the resulting p-n junction characteristics.

Main Results:

  • Successfully formed well-behaved, sharp p-n junctions in graphene.
  • Demonstrated that the junction's position and height are controllable.
  • Achieved junction formation via substrate electronic modification, bypassing the need for extra gates.

Conclusions:

  • Substrate modification offers a novel and effective route to create tunable p-n junctions in graphene.
  • This approach simplifies the fabrication of graphene-based electronic devices.
  • The controlled junction formation opens possibilities for advanced graphene electronics.