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The bridge rectifier is essential in electronics for efficiently converting alternating current (AC) to direct current (DC). Comprised of four diodes configured in a bridge layout, this rectifier effectively processes both the positive and negative halves of the AC waveform, making it superior to half-wave and full-wave center-tapped rectifiers in terms of voltage regulation and output stability.
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Atomic Scale Modulation of Self-Rectifying Resistive Switching by Interfacial Defects.

Xing Wu1,2, Kaihao Yu2, Dongkyu Cha3

  • 1Division of Microelectronics School of Electrical and Electronic Engineering Nanyang Technological University Singapore 639798 Singapore.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
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Summary

This study presents a novel asymmetric self-rectifying resistive switching device using a highly doped silicon substrate. This design effectively suppresses sneak path currents, crucial for high-density memory applications.

Keywords:
hafnium dioxidein situ transmission electron microscopyinterfacial defectsoxygen vacanciesresistive switching

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Nanotechnology

Background:

  • Resistive switching memory offers high density and computational performance.
  • Sneak path currents in crossbar arrays hinder cell selection and reliability.

Purpose of the Study:

  • To fabricate and characterize an asymmetric self-rectifying resistive switching device.
  • To investigate the mechanisms suppressing sneak path currents for reliable array-level operation.

Main Methods:

  • Fabrication of Ni-electrode/HfO2/SiO2/n++ Si devices.
  • In situ transmission electron microscopy for atomic-scale defect analysis.
  • Analysis of interfacial defects and conductive filament evolution.

Main Results:

  • Reproducible rectifying behavior achieved due to interfacial defects.
  • Atomic-scale understanding of defect morphology, chemistry, and dynamics.
  • Correlation between oxygen vacancies, Ni-rich filaments, and resistive switching.

Conclusions:

  • The developed device architecture effectively mitigates sneak path currents.
  • Atomic-level insights into defect dynamics are key to resistive switching performance.
  • This work has significant implications for high-density resistive switching memory arrays.