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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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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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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
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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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Controlling the Formation of Conductive Pathways in Memristive Devices.

Robert Winkler1,2, Alexander Zintler2, Stefan Petzold1

  • 1Advanced Thin Film Technology Division, Institute of Materials Science, Technical University of Darmstadt, Alarich-Weiss-Straße 2, 64287, Darmstadt, Germany.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|September 8, 2022
PubMed
Summary

Engineered defects in HfOx enable reproducible, low-voltage resistive switching for memristive devices. Grain boundary orientation critically influences filament formation, paving the way for reliable in-memory computing and neuromorphic applications.

Keywords:
first principle calculationgrain boundary atomic structureshafnium oxideresistive switching memoryscanning transmission electron microscopy

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Computer Engineering

Background:

  • Resistive random-access memories (ReRAM) are crucial for advanced computing architectures like in-memory computing and neuromorphic systems.
  • The stochastic nature of conductive filament formation in ReRAM leads to significant device variability.
  • Understanding atomistic defect configurations is key to overcoming these limitations.

Purpose of the Study:

  • To investigate the role of 0D and 2D defects in controlling conductive filament formation in HfOx-based memristive devices.
  • To reveal the influence of grain boundary orientation on the forming voltage and variability of memristors.
  • To establish a fundamental atomistic understanding of defect chemistry for designing reliable memristive devices.

Main Methods:

  • Utilized ultra-high resolution imaging to determine realistic atomic structures of grain boundaries.
  • Employed first-principles calculations, including local strain effects, to analyze defect behavior.
  • Investigated oxygen vacancy segregation energies and their impact on electronic states near the Fermi level.

Main Results:

  • Demonstrated that engineered interplay of 0D and 2D defects enables reproducible, low-voltage conductive filament formation.
  • Established a direct correlation between grain boundary orientation in polycrystalline HfOx and the required forming voltage.
  • Identified oxygen vacancy segregation and associated electronic states as governing factors for conductive pathway formation.

Conclusions:

  • Grain boundary engineering offers a pathway to control variability in memristive devices.
  • Atomistic understanding of defect chemistry is essential for the rational design of future electronic components.
  • These findings are applicable to non-amorphous valence change filamentary memristive devices, enhancing their reliability for advanced applications.