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Related Concept Videos

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Atomic Force Microscopy

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Updated: Dec 24, 2025

Co-localizing Kelvin Probe Force Microscopy with Other Microscopies and Spectroscopies: Selected Applications in Corrosion Characterization of Alloys
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Pulsed Force Kelvin Probe Force Microscopy.

Devon S Jakob1, Haomin Wang1, Xiaoji G Xu1

  • 1Department of Chemistry, Lehigh University, 6 East Packer Avenue, Bethlehem, Pennsylvania 18015, United States.

ACS Nano
|April 14, 2020
PubMed
Summary
This summary is machine-generated.

A new pulsed force Kelvin Probe Force Microscopy (PF-KPFM) technique achieves nanoscale surface potential mapping with <10 nm resolution. This advancement overcomes limitations of conventional methods for analyzing electronic structures and surface charges.

Keywords:
Kelvin probe force microscopyatomic force microscopycontact potentialpeak force tappingphotovoltaicssemiconductor deviceswork function

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Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • Contact potential difference (CPD) and work function measurements are crucial for understanding material electronic structures and surface charges.
  • Conventional Kelvin probe force microscopy (KPFM) offers nanoscale surface potential mapping but is often limited to 30-100 nm spatial resolution.
  • Decreasing device sizes necessitate higher resolution techniques for electrical property characterization.

Purpose of the Study:

  • To introduce a novel KPFM technique with significantly enhanced spatial resolution.
  • To enable precise nanoscale electrical property mapping of complex materials and devices.
  • To overcome the resolution limitations of existing KPFM methods.

Main Methods:

  • Development of pulsed force Kelvin Probe Force Microscopy (PF-KPFM), a single-pass technique.
  • Utilizes intrinsic Fermi level alignment and spontaneous electron redistribution for signal generation.
  • Extracts cantilever oscillation amplitude to derive surface potential without external oscillating voltage.

Main Results:

  • PF-KPFM achieves a spatial resolution of less than 10 nm under ambient conditions.
  • Demonstrated in situ determination of ohmic/nonohmic contacts in semiconductors.
  • Successfully mapped ferroelectric domain boundaries in BaTiO3 and characterized protein aggregates.

Conclusions:

  • PF-KPFM offers a substantial improvement in spatial resolution for surface potential mapping.
  • The technique is applicable to a wide range of materials, including semiconductors, ferroelectrics, and biological samples.
  • Enables detailed characterization of nanometer-scale electrical properties for emerging technologies.