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High-low Kelvin probe force spectroscopy for measuring the interface state density.

Ryo Izumi1, Masato Miyazaki1, Yan Jun Li1

  • 1Department of Applied Physics, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.

Beilstein Journal of Nanotechnology
|February 10, 2023
PubMed
Summary

High-low Kelvin probe force spectroscopy (high-low KPFS) measures semiconductor interface states. This new method quantifies interface state density, crucial for semiconductor device evaluation.

Keywords:
Kelvin probe force microscopyKelvin probe force spectroscopyhigh–low Kelvin probe force microscopyhigh–low Kelvin probe force spectroscopyinterface state density

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Area of Science:

  • Semiconductor Physics
  • Materials Science
  • Surface Science

Background:

  • Semiconductor interface states significantly impact device performance.
  • Accurate characterization of interface state density is vital for device optimization.
  • Existing methods may lack the required spatial resolution or spectral information.

Purpose of the Study:

  • To develop a novel electrostatic force spectroscopy method for quantifying semiconductor interface state density.
  • To introduce high-low Kelvin probe force spectroscopy (high-low KPFS) as an advancement over Kelvin probe force microscopy (KPFM).
  • To provide a method for obtaining the energy spectrum of interface state density.

Main Methods:

  • Development of high-low Kelvin probe force spectroscopy (high-low KPFS).
  • Derivation of analytical expressions for electrostatic forces considering bulk and interface charge transfer.
  • Application of high- and low-frequency AC bias voltages to probe semiconductor surfaces.

Main Results:

  • High-low KPFS successfully measures interface state density with high spatial resolution.
  • Analysis of electrostatic forces in the depletion region yields interface state density information.
  • Preliminary experiments on ion-implanted silicon confirm the method's validity.

Conclusions:

  • High-low KPFS is a promising technique for characterizing semiconductor interfaces.
  • The method provides crucial data on interface state energy spectra for device engineering.
  • This technique advances the evaluation of semiconductor materials and devices.