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Time-Dependent Negative Capacitance Effects in Al2O3/BaTiO3 Bilayers.

Yu Jin Kim1, Hiroyuki Yamada2, Taehwan Moon1

  • 1Department of Materials Science & Engineering and Inter-University Semiconductor Research Center, Seoul National University , Seoul 151-744, Republic of Korea.

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Summary
This summary is machine-generated.

Negative capacitance (NC) effects in ferroelectric materials offer solutions for low-power electronics. By using short-pulse charging in Al2O3/BaTiO3 capacitors, researchers achieved hysteresis-free capacitance boosting, enabling critical device applications.

Keywords:
Negative capacitancecharge injectiondepolarization fieldferroelectrics thin filmshysteresislow-power devices

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Electrical Engineering

Background:

  • Negative capacitance (NC) effects in ferroelectric materials are promising for low-power transistors and high-charge-density capacitors.
  • Steep switching characteristics (subthreshold swing < 60 mV/dec) have been shown, but hysteresis limits practical applications.

Purpose of the Study:

  • To reinterpret hysteretic properties of NC effects in the time domain.
  • To demonstrate hysteresis-free capacitance boosting in Al2O3/BaTiO3 bilayer capacitors.
  • To identify the origin of hysteresis in NC devices.

Main Methods:

  • Utilized short-pulse charging on Al2O3/BaTiO3 bilayer capacitors.
  • Analyzed hysteretic properties within the time domain.
  • Investigated the role of dielectric leakage in ferroelectric polarization switching.

Main Results:

  • Achieved capacitance (charge) boosting without hysteresis using short-pulse charging.
  • Identified dielectric leakage as the origin of hysteresis in NC devices.
  • Demonstrated that hysteresis suppression is possible within specific time and voltage ranges.

Conclusions:

  • Hysteresis in NC devices arises from dielectric leakage, which impedes ferroelectric polarization switching during short pulses.
  • Non-hysteretic NC effects are achievable within limited time and voltage parameters, sufficient for critical device applications.
  • Short-pulse charging is a viable method to overcome hysteresis in NC devices for practical applications.