Novel photoexcitation method for light-addressable potentiometric sensor with higher spatial resolution

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

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

A novel photoexcitation method for the light-addressable potentiometric sensor (LAPS) is proposed to achieve a higher spatial resolution of chemical images. The proposed method employs a combined light source that consists of a modulated light probe, which generates the alternating photocurrent signal, and a ring of constant illumination surrounding it. The constant illumination generates a sheath of carriers with increased concentration which suppresses the spread of photocarriers by enhanced recombination. A device simulation was carried out to verify the effect of constant illumination on the spatial resolution, which demonstrated that a higher spatial resolution can be obtained.

Original languageEnglish
Article number067301
JournalApplied Physics Express
Volume7
Issue number6
DOIs
Publication statusPublished - 2014 Jun

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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