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Related Concept Videos

P-N junction01:11

P-N junction

540
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...
540
Biasing of P-N Junction01:16

Biasing of P-N Junction

548
The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
548
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

353
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
353

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Related Experiment Video

Updated: Jul 9, 2025

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Transparent Patternable Large-Area Graphene p-n Junctions by Photoinduced Electron Doping.

Kazuhiro Kirihara1,2, Yuki Okigawa2,3, Masatou Ishihara2

  • 1Advanced Operando-Measurement Technology Open Innovation Laboratory (OPERANDO-OIL), National Institute of Advanced Industrial Science and Technology (AIST), 5-1-5 Kashiwanoha, Kashiwa 277-8565, Japan.

ACS Applied Materials & Interfaces
|December 4, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel photoinduced electron doping method for graphene using photobase generators (PBGs). This technique enables precise control over graphene doping and the creation of p-n junctions for advanced electronic applications.

Keywords:
dopinggraphenepatterningphotobase generatorp–n junctionthermocouplestransparent devices

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Graphene's unique electronic properties make it a promising material for next-generation electronics.
  • Achieving controlled doping and creating functional p-n junctions in graphene remains a significant challenge.
  • Existing doping methods often lack spatial and temporal precision.

Purpose of the Study:

  • To introduce a novel photoinduced electron doping method for graphene using photobase generators (PBGs).
  • To demonstrate the creation of graphene p-n junctions with controlled doping.
  • To explore the potential of this method for electronic, optoelectronic, and thermoelectric applications.

Main Methods:

  • Utilized photobase generators (PBGs) for light-activated, spatially selective doping of graphene.
  • Employed selective light irradiation to switch graphene doping from p-type to n-type.
  • Characterized doping changes via electromotive force, Seebeck, and Hall coefficient measurements.
  • Fabricated transparent graphene thermocouples for temperature sensing.

Main Results:

  • Achieved stable n-type doping in graphene with high electron mobility (>1000 cm² V⁻¹s⁻¹) over two months.
  • Successfully created graphene p-n junctions with precise doping control.
  • Demonstrated transparent graphene thermocouples with a significant electromotive force (approx. 80 μV/K).

Conclusions:

  • The photoinduced electron doping method offers precise spatial and temporal control over graphene doping.
  • This technique enables the fabrication of high-performance graphene-based electronic and thermoelectric devices.
  • The developed method is promising for practical implementation of graphene in various technological fields.