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Artifacts in time-resolved Kelvin probe force microscopy.

Sascha Sadewasser1, Nicoleta Nicoara1, Santiago D Solares2

  • 1International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal.

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|May 17, 2018
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Summary
This summary is machine-generated.

Kelvin probe force microscopy (KPFM) measurements can be prone to artifacts from frequency mixing. This study reveals how bias or light modulation can lead to falsified results in semiconductor charge dynamics characterization.

Keywords:
Kelvin probe force microscopytime-resolved

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Area of Science:

  • Surface science
  • Nanotechnology
  • Materials science

Background:

  • Kelvin probe force microscopy (KPFM) is crucial for nanoscale characterization of materials, particularly semiconductors.
  • Understanding charge carrier dynamics in semiconductors is of significant interest.
  • Time-resolved KPFM techniques with picosecond resolution have emerged using modulated signals.

Purpose of the Study:

  • To investigate artifacts in KPFM measurements caused by frequency mixing during modulated excitation.
  • To analyze the impact of bias modulation on cantilever dynamics and KPFM signal integrity.
  • To provide guidelines for mitigating artifacts in time-resolved KPFM experiments.

Main Methods:

  • Numerical simulations of cantilever oscillation under bias-modulated KPFM.
  • Fast Fourier Transform (FFT) analysis of simulated cantilever dynamics.
  • Experimental validation using a model system with bias and light modulation.

Main Results:

  • Bias modulation, especially with square pulses, can induce complex frequency mixing, leading to artifacts at the detection frequency.
  • Simulations accurately predict artifacts, with minor deviations attributed to transients and higher-order components.
  • Experimental results confirm simulation findings and reveal additional artifacts from interference and photodetector illumination.

Conclusions:

  • Frequency mixing in KPFM due to modulation signals can cause significant measurement artifacts, particularly in semiconductor research.
  • Careful consideration of modulation types, frequencies, and experimental setups is necessary to avoid falsified KPFM data.
  • The study provides essential insights and practical guidelines for accurate time-resolved KPFM characterization.