Journal Article

FZJ-2014-00653

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Frequency behaviour of light-addressable potentiometric sensors.

Werner, C. F. (Corresponding author) ; Wagner, T. ; Yoshinobu, T. ; Keusgen, M. ; Schöning, M. J.FZJ*

2013
Wiley-VCH Weinheim

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Please use a persistent id in citations: doi:10.1002/pssa.201200929

Abstract: Light-addressable potentiometric sensors (LAPS) are semiconductor- based potentiometric sensors, with the advantage to detect the concentration of a chemical species in a liquid solution above the sensor surface in a spatially resolved manner. The addressing is achieved by a modulated and focused light source illuminating the semiconductor and generating a concentration-depending photocurrent. This work introduces a LAPS set-up that is able to monitor the electrical impedance in addition to the photocurrent. The impedance spectra of a LAPS structure, with and without illumination, as well as the frequency behaviour of the LAPS measurement are investigated. The measurements are supported by electrical equivalent circuits to explain the impedance and the LAPS-frequency behaviour. The work investigates the influence of different parameters on the frequency behaviour of the LAPS. Furthermore, the phase shift of the photocurrent, the influence of the surface potential as well as the changes of the sensor impedance will be discussed

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Contributing Institute(s):

1. Bioelektronik (PGI-8)
2. JARA-FIT (JARA-FIT)
3. Bioelektronik (ICS-8)

Research Program(s):

1. 423 - Sensorics and bioinspired systems (POF2-423) (POF2-423)
2. 453 - Physics of the Cell (POF2-453) (POF2-453)

Appears in the scientific report 2013

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Database coverage:
; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection ; Zoological Record

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