Device simulation of the light-addressable potentiometric sensor with a novel photoexcitation method for a higher spatial resolution

Yuanyuan Guo, Kosuke Seki, Ko Ichiro Miyamoto, Torsten Wagner, Michael J. Schöning, Tatsuo Yoshinobu

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)

Abstract

A novel photoexcitation method for the light-addressable potentiometric sensor (LAPS) realized a higher spatial resolution of chemical imaging. In this method, a modulated light probe, which generates the alternating photocurrent signal, is surrounded by a ring of constant light, which suppresses the lateral diffusion of photocarriers by enhancing recombination. A device simulation verified that a higher spatial resolution could be obtained by adjusting the gap between the modulated and constant light. It was also found that a higher intensity and a longer wavelength of constant light was more effective. However, there exists a tradeoff between the spatial resolution and the amplitude of the photocurrent, and thus, the signal-to-noise ratio. A tilted incidence of constant light was applied, which could achieve even higher resolution with a smaller loss of photocurrent.

Original languageEnglish
Pages (from-to)456-459
Number of pages4
JournalProcedia Engineering
Volume87
DOIs
Publication statusPublished - 2014
Event28th European Conference on Solid-State Transducers, EUROSENSORS 2014 - Brescia, Italy
Duration: 2014 Sep 72014 Sep 10

Keywords

  • Light-addressable potentiometric sensor
  • Novel photoexcitation method
  • Spatial resolution
  • Tilted constant illumination

ASJC Scopus subject areas

  • Engineering(all)

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