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Scanning Kelvin probe microscopy (SKPM) measures device potential but is distorted by tip-sample interactions. This study quantitatively explains SKPM response, linking models to experimental data for accurate potential profiling.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Surface Science

Background:

  • Noncontact potentiometry, or scanning Kelvin probe microscopy (SKPM), is crucial for analyzing charge injection and transport in organic and inorganic devices.
  • A key limitation of SKPM is that experimental measurements often deviate from the true potential profile due to nonlocal tip-sample coupling.

Purpose of the Study:

  • To quantitatively explain the observed SKPM response in devices.
  • To establish a direct link between theoretical device models and experimentally measurable quantities.
  • To elucidate the influence of tip-sample distance and tip orientation on SKPM measurements.

Main Methods:

  • Development of a quantitative model to interpret SKPM measurements.
  • Analysis of the effects of tip-sample distance on the SKPM signal.
  • Investigation of the impact of probing tip orientation relative to the device.

Main Results:

  • The developed model successfully explains the experimental SKPM response.
  • The model accurately predicts the influence of tip-sample distance on potential measurements.
  • The dependence of SKPM measurements on the probing tip's orientation is quantitatively elucidated.

Conclusions:

  • This work provides a quantitative understanding of SKPM artifacts arising from tip-sample interactions.
  • The findings enable more accurate interpretation of SKPM data for studying electronic devices.
  • The model bridges the gap between theoretical simulations and experimental observables in SKPM.