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Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
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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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Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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Fabrication of Schottky Diodes on Zn-polar BeMgZnO/ZnO Heterostructure Grown by Plasma-assisted Molecular Beam Epitaxy
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Ferroelectric-Domain-Patterning-Controlled Schottky Junction State in Monolayer MoS_{2}.

Zhiyong Xiao1,2, Jingfeng Song1,2, David K Ferry3

  • 1Department of Physics and Astronomy, University of Nebraska-Lincoln, Nebraska 68588-0299, USA.

Physical Review Letters
|June 24, 2017
PubMed
Summary
This summary is machine-generated.

Researchers used scanning probes to pattern ferroelectric domains, altering monolayer MoS_{2} (molybdenum disulfide) from a transistor to a junction state. This creates tunable Schottky barriers, enabling programmable functionalities in 2D materials.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Ferroelectric materials offer nonvolatile control over electronic properties.
  • Monolayer transition metal dichalcogenides (TMDs) like MoS_{2} are promising for next-generation electronics.
  • Hybrid van der Waals heterostructures combine distinct material functionalities.

Purpose of the Study:

  • To demonstrate nonvolatile modulation of MoS_{2} conduction characteristics using ferroelectric domain patterning.
  • To investigate the electronic transport properties at the domain walls in MoS_{2}.
  • To explore the tunability of the induced Schottky barrier height and its dependence on material parameters.

Main Methods:

  • Scanning probe microscopy for controlled ferroelectric domain patterning.
  • Electrical transport measurements (I-V characteristics) of monolayer MoS_{2}.
  • Analysis using the thermionic emission model to extract Schottky barrier parameters.

Main Results:

  • Achieved nonvolatile switching of MoS_{2} between transistor and junction states via domain patterning.
  • Observed rectified current-voltage characteristics at domain walls, consistent with thermionic emission.
  • Demonstrated tunable Schottky barrier height (0.38–0.57 eV) using a global back gate.

Conclusions:

  • Scanning-probe-induced ferroelectric domain patterning provides a route to programmable functionalities in MoS_{2}.
  • The tunable Schottky barrier height is sensitive to trapping states within the MoS_{2} conduction band.
  • This approach offers insights into performance limitations and design strategies for hybrid van der Waals systems.