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Determining Grain Boundary Potential from Electrostatic Force Based Scanning Probe Imaging

Published online by Cambridge University Press:  02 July 2020

Dawn A. Bonnell  and
Sergei V. Kalinin
Dawn A. Bonnell
Affiliation:
Dept. Mat. Sci. Eng., University of Pennsylvania, 3231 Walnut St., Philadelphia, PA19104
Sergei V. Kalinin
Affiliation:
Dept. Mat. Sci. Eng., University of Pennsylvania, 3231 Walnut St., Philadelphia, PA19104
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Extract

A combination of electrostatic force microscopy (EFM) and scanning surface potential microscopy (SSPM) is used to quantify nanometer scale field variations for the general case of electronically inhomogeneous surfaces. The specific example illustrated here is the intersection of a Σ5 grain boundary in donor doped SrTiO3 intersecting the (100) surface. ‘The topographic structure is compared to the surface potential, the positive and the negative electrostatic force images in figure 1. The EFM contrast changes sign with the polarity of the applied bias, as expected for an electrostatic attractive/repulsive interaction. There is a significant localization of surface potential at the grain boundary that is manifest as a protrusion in the SPPM image.

To quantify the properties at the surface, rather than above the surface where the measurements are acquired, a relationship connecting the sample-tip interaction is required. It has been shown that models based on simple geometric assumptions do not represent the behavior well.

Type
Scanned Probe Microscopy
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 720 - 721
Copyright
Copyright © Microscopy Society of America

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References

References:

1. We are grateful to G. Duscher and.S. Pennycook for the bicrystal samples.Google Scholar
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