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MOS Capacitor

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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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MOSFET: Enhancement Mode01:22

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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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MOSFET01:16

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The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
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Non-ohmic Devices00:51

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In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
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MOSFET: Depletion Mode01:20

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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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Design Example: Resistive Touchscreen01:14

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A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
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Related Experiment Video

Updated: Sep 22, 2025

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
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Interface-Modulated Resistive Switching in Mo-Irradiated ReS2 for Neuromorphic Computing.

Mei Er Pam1, Sifan Li1, Tong Su2

  • 1Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117583, Singapore.

Advanced Materials (Deerfield Beach, Fla.)
|May 24, 2022
PubMed
Summary

Researchers transformed an inactive 2D material, rhenium disulfide (ReS2), into a memristor using molybdenum irradiation doping. This breakthrough enables atomic-level control of resistive switching for advanced electronic applications.

Keywords:
artificial synapsesbilayer resistive materialsdopingmemristorrhenium disulfide

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid-State Physics

Background:

  • Resistive switching (RS) in 2D materials is crucial for memristors.
  • Controlling RS via doping and impurity scattering is underexplored in 2D materials.

Purpose of the Study:

  • To develop a facile method for transforming RS-inactive 2D materials into effective switching materials.
  • To investigate the mechanism of RS in molybdenum-irradiated rhenium disulfide (Mo-ReS2).

Main Methods:

  • Interfacial modulation of rhenium disulfide (ReS2) using molybdenum-irradiation (Mo-i) doping.
  • Fabrication and characterization of Mo-ReS2 memristors.
  • Analysis of the resistive switching mechanism involving beta-rhenium dioxide (β-ReO2) filament formation.

Main Results:

  • RS-inactive ReS2 was successfully converted into a switchable memristive material.
  • A novel RS mechanism based on β-ReO2 filament formation/dissolution was identified.
  • Mo-ReS2 memristors demonstrated a high switching ratio, multilevel states, and synaptic plasticity.
  • Achieved 91% MNIST learning accuracy with the fabricated device.

Conclusions:

  • Interfacial modulation via Mo-i doping is an effective strategy to enable RS in inactive 2D materials.
  • The study highlights the potential of doping-induced charged impurity scattering for memristive applications.
  • Mo-ReS2 offers a promising platform for next-generation neuromorphic computing and memory devices.