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Sensors 2018, 18(11), 4068; https://doi.org/10.3390/s18114068

Designing a Robust Kelvin Probe Setup Optimized for Long-Term Surface Photovoltage Acquisition

1
Institut für Angewandte Physik, Technische Universität Dresden, Nöthnitzer Str. 61, 01187 Dresden, Germany
2
Fakultät Physik, Technische Universität Dresden, Haeckelstr. 3, 01069 Dresden, Germany
*
Author to whom correspondence should be addressed.
Received: 16 October 2018 / Revised: 16 November 2018 / Accepted: 17 November 2018 / Published: 21 November 2018
(This article belongs to the Section Physical Sensors)
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Abstract

We introduce a robust low-budget Kelvin probe design that is optimized for the long-term acquisition of surface photovoltage (SPV) data, especially developed for highly resistive systems, which exhibit—in contrast to conventional semiconductors—very slow photoinduced charge relaxation processes in the range of hours and days. The device provides convenient optical access to the sample, as well as high mechanical and electrical stability due to off-resonance operation, showing a noise band as narrow as 1 mV. Furthermore, the acquisition of temperature-dependent SPV transients necessary for SPV-based deep-level transient spectroscopy becomes easily possible. The performance of the instrument is demonstrated by recording long-term SPV transients of the ultra-slowly relaxing model oxide strontium titanate (SrTiO 3 ) over 20 h. View Full-Text
Keywords: Kelvin probe; surface photovoltage; SPV; electronic defect states; surface states; contact potential difference; CPD; SrTiO3; wide-bandgap semiconductor; photorelaxation Kelvin probe; surface photovoltage; SPV; electronic defect states; surface states; contact potential difference; CPD; SrTiO3; wide-bandgap semiconductor; photorelaxation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Beyreuther, E.; Grafström, S.; Eng, L.M. Designing a Robust Kelvin Probe Setup Optimized for Long-Term Surface Photovoltage Acquisition. Sensors 2018, 18, 4068.

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