Artifacts in time-resolved Kelvin probe force microscopy
Abstract
Kelvin probe force microscopy (KPFM) has been used for the characterization of metals, insulators, and semiconducting materials on the nanometer scale. Especially in semiconductors, the charge dynamics are of high interest. Recently, several techniques for time-resolved measurements with time resolution down to picoseconds have been developed, many times using a modulated excitation signal, e.g. light modulation or bias modulation that induces changes in the charge carrier distribution. For fast modulation frequencies, the KPFM controller measures an average surface potential, which contains information about the involved charge carrier dynamics. Here, we show that such measurements are prone to artifacts due to frequency mixing, by performing numerical dynamics simulations of the cantilever oscillation in KPFM subjected to a bias-modulated signal. For square bias pulses, the resulting time-dependent electrostatic forces are very complex and result in intricate mixing of frequencies that may, in some cases, have a component at the detection frequency, leading to falsified KPFM measurements. Additionally, we performed fast Fourier transform (FFT) analyses that match the results of the numerical dynamics simulations. Small differences are observed that can be attributed to transients and higher-order Fourier components, as a consequence of the intricate nature of the cantilever driving forces. These results aremore »
- Authors:
-
- International Iberian Nanotechnology Lab., Braga (Portugal)
- The George Washington Univ., Washington, D.C. (United States)
- Publication Date:
- Research Org.:
- George Washington Univ., Washington, DC (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Contributing Org.:
- International Iberian Nanotechnology Laboratory, Portugal
- OSTI Identifier:
- 1434250
- Grant/Contract Number:
- SC0018041
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Beilstein Journal of Nanotechnology
- Additional Journal Information:
- Journal Volume: 9; Journal ID: ISSN 2190-4286
- Publisher:
- Beilstein Institute
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 47 OTHER INSTRUMENTATION; 77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE; Kelvin probe force microscopy; time-resolved
Citation Formats
Sadewasser, Sascha, Nicoara, Nicoleta, and Solares, Santiago D. Artifacts in time-resolved Kelvin probe force microscopy. United States: N. p., 2018.
Web. doi:10.3762/bjnano.9.119.
Sadewasser, Sascha, Nicoara, Nicoleta, & Solares, Santiago D. Artifacts in time-resolved Kelvin probe force microscopy. United States. https://doi.org/10.3762/bjnano.9.119
Sadewasser, Sascha, Nicoara, Nicoleta, and Solares, Santiago D. Tue .
"Artifacts in time-resolved Kelvin probe force microscopy". United States. https://doi.org/10.3762/bjnano.9.119. https://www.osti.gov/servlets/purl/1434250.
@article{osti_1434250,
title = {Artifacts in time-resolved Kelvin probe force microscopy},
author = {Sadewasser, Sascha and Nicoara, Nicoleta and Solares, Santiago D.},
abstractNote = {Kelvin probe force microscopy (KPFM) has been used for the characterization of metals, insulators, and semiconducting materials on the nanometer scale. Especially in semiconductors, the charge dynamics are of high interest. Recently, several techniques for time-resolved measurements with time resolution down to picoseconds have been developed, many times using a modulated excitation signal, e.g. light modulation or bias modulation that induces changes in the charge carrier distribution. For fast modulation frequencies, the KPFM controller measures an average surface potential, which contains information about the involved charge carrier dynamics. Here, we show that such measurements are prone to artifacts due to frequency mixing, by performing numerical dynamics simulations of the cantilever oscillation in KPFM subjected to a bias-modulated signal. For square bias pulses, the resulting time-dependent electrostatic forces are very complex and result in intricate mixing of frequencies that may, in some cases, have a component at the detection frequency, leading to falsified KPFM measurements. Additionally, we performed fast Fourier transform (FFT) analyses that match the results of the numerical dynamics simulations. Small differences are observed that can be attributed to transients and higher-order Fourier components, as a consequence of the intricate nature of the cantilever driving forces. These results are corroborated by experimental measurements on a model system. In the experimental case, additional artifacts are observed due to constructive or destructive interference of the bias modulation with the cantilever oscillation. Also, in the case of light modulation, we demonstrate artifacts due to unwanted illumination of the photodetector of the beam deflection detection system. Lastly, guidelines for avoiding such artifacts are given.},
doi = {10.3762/bjnano.9.119},
journal = {Beilstein Journal of Nanotechnology},
number = ,
volume = 9,
place = {United States},
year = {2018},
month = {4}
}
Web of Science
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