Frequency behaviour of light-addressable potentiometric sensors

Carl Frederik Werner, Torsten Wagner, Tatsuo Yoshinobu, Michael Keusgen, Michael J. Schöning

研究成果: Article査読

10 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)884-891
ページ数8
ジャーナルPhysica Status Solidi (A) Applications and Materials Science
210
5
DOI
出版ステータスPublished - 2013 5

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • 表面および界面
  • 表面、皮膜および薄膜
  • 電子工学および電気工学
  • 材料化学

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