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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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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...
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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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Ion-Locking in Solid Polymer Electrolytes for Reconfigurable Gateless Lateral Graphene p-n Junctions.

Jierui Liang1, Ke Xu1, Swati Arora2

  • 1Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, PA 15260, USA.

Materials (Basel, Switzerland)
|March 4, 2020
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Summary

Researchers demonstrate reconfigurable, gateless graphene p-n junctions using ion-locking with solid polymer electrolytes. This novel approach enables tunable electronic properties for advanced logic circuits.

Keywords:
electric double layergrapheneion dopingp-n junctionpolymer electrolyte

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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 advanced electronic devices.
  • Creating tunable p-n junctions in graphene is crucial for developing novel electronic functionalities.
  • Existing methods for creating graphene p-n junctions often require complex gating structures.

Purpose of the Study:

  • To demonstrate a novel method for creating reconfigurable, gateless lateral p-n junctions in graphene.
  • To explore the use of ion-locking with solid polymer electrolytes for stable electric-double-layer (EDL) formation.
  • To investigate the potential of this approach for applications in polymorphic logic circuits.

Main Methods:

  • Utilized solid polymer electrolytes, including polyethylene oxide (PEO) and a custom doubly-polymerizable ionic liquid (DPIL), to induce p- and n-type regions in graphene via EDLs.
  • Employed ion-locking mechanisms: thermal quenching for PEO:CsClO4 and thermally triggered polymerization for DPIL.
  • Characterized the graphene p-n junctions using backgated transfer measurements, observing characteristic current minima.

Main Results:

  • Successfully demonstrated gateless lateral p-n junctions in graphene using two distinct ion-locking strategies.
  • Achieved reconfigurability from a p-n to an n-p junction using the PEO:CsClO4 electrolyte by resetting and cooling the device.
  • Confirmed the formation of p-n junctions through the observation of two current minima in transfer characteristics.

Conclusions:

  • Developed an alternative and effective method for locking EDLs on two-dimensional (2D) materials.
  • Showcased the feasibility of creating reconfigurable, gateless lateral p-n junctions in graphene.
  • Highlighted the potential of this technology for future polymorphic logic circuits and other advanced electronic applications.