%0 Journal Article
%A Werner, Carl Frederik
%A Wagner, Torsten
%A Yoshinobu, Tatsuo
%A Keusgen, Michael
%A Schöning, Michael J.
%T Frequency behaviour of light-addressable potentiometric sensors.
%J Physica status solidi / A
%V 210
%N 5
%@ 1862-6300
%C Weinheim
%I Wiley-VCH
%M FZJ-2014-00653
%P 884 - 891
%D 2013
%X Light-addressable potentiometric sensors (LAPS) are semiconductor-
%X based potentiometric sensors, with the advantage to
%X detect the concentration of a chemical species in a liquid
%X solution above the sensor surface in a spatially resolved manner.
%X The addressing is achieved by a modulated and focused light
%X source illuminating the semiconductor and generating a
%X concentration-depending photocurrent. This work introduces
%X a LAPS set-up that is able to monitor the electrical impedance
%X in addition to the photocurrent. The impedance spectra of a
%X LAPS structure, with and without illumination, as well as the
%X frequency behaviour of the LAPS measurement are investigated.
%X The measurements are supported by electrical equivalent
%X circuits to explain the impedance and the LAPS-frequency
%X behaviour. The work investigates the influence of different
%X parameters on the frequency behaviour of the LAPS. Furthermore,
%X the phase shift of the photocurrent, the influence of
%X the surface potential as well as the changes of the sensor
%X impedance will be discussed
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000319151900010
%R 10.1002/pssa.201200929
%U https://juser.fz-juelich.de/record/150604