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@ARTICLE{Werner:150604,
      author       = {Werner, Carl Frederik and Wagner, Torsten and Yoshinobu,
                      Tatsuo and Keusgen, Michael and Schöning, Michael J.},
      title        = {{F}requency behaviour of light-addressable potentiometric
                      sensors.},
      journal      = {Physica status solidi / A},
      volume       = {210},
      number       = {5},
      issn         = {1862-6300},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {FZJ-2014-00653},
      pages        = {884 - 891},
      year         = {2013},
      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},
      cin          = {PGI-8 / JARA-FIT / ICS-8},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-8-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)ICS-8-20110106},
      pnm          = {423 - Sensorics and bioinspired systems (POF2-423) / 453 -
                      Physics of the Cell (POF2-453)},
      pid          = {G:(DE-HGF)POF2-423 / G:(DE-HGF)POF2-453},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000319151900010},
      doi          = {10.1002/pssa.201200929},
      url          = {https://juser.fz-juelich.de/record/150604},
}