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Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
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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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Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
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Updated: Aug 22, 2025

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Ag-Ion-Based Transparent Threshold Switching Selector with Filament-Size-Dependent Rectifying Behavior.

Jongseon Seo1, Geonhui Han1, Hyejin Kim1

  • 1Department of Electronic Materials Engineering, Kwangwoon University, Seoul 01897, Korea.

Micromachines
|November 11, 2022
PubMed
Summary

A novel transparent threshold switch using silver (Ag) filaments enables selector devices for high-density memory arrays. This device exhibits both threshold switching and rectifying behavior, significantly increasing crossbar array size.

Keywords:
memory switching deviceself-rectifying characteristicsthreshold switching devicetransparent device

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Device Engineering

Background:

  • Crossbar arrays are crucial for high-density memory integration.
  • Selector devices are needed to prevent sneak paths in crossbar arrays.
  • Transparent conductive materials are desirable for advanced optoelectronic applications.

Purpose of the Study:

  • To develop a transparent threshold switch for selector applications in crossbar arrays.
  • To investigate the filament size control for achieving threshold switching and rectifying behavior.
  • To analyze the conduction mechanism responsible for the observed device characteristics.

Main Methods:

  • Fabrication of a metal-insulator-metal (MIM) device structure using Ag filaments.
  • Characterization of electrical transport properties, including threshold switching and I-V curves.
  • Analysis of conduction mechanisms using Schottky barrier models.

Main Results:

  • A functional transparent threshold switch based on Ag filaments was successfully developed.
  • Both threshold switching and rectifying behaviors were achieved by controlling filament size.
  • Schottky barrier formation at the interface was identified as the cause of rectifying behavior.
  • The device enables a 105-times larger available crossbar array size.

Conclusions:

  • The developed Ag-filament-based transparent threshold switch is a promising selector device for advanced memory applications.
  • Sensitive control of filament size is key to achieving desired switching and rectifying functionalities.
  • The device offers a significant advantage in terms of scalability for high-density memory integration.