Improved spatial resolution of the chemical imaging sensor with a hybrid illumination that suppresses lateral diffusion of photocarriers

Ko ichiro Miyamoto, Kosuke Seki, Takeyuki Suto, Carl Frederik Werner, Torsten Wagner, Michael J. Schöning, Tatsuo Yoshinobu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The chemical imaging sensor is a semiconductor-based chemical sensor capable of visualizing pH and ion distributions. The spatial resolution depends on the lateral diffusion of photocarriers generated by illumination of the semiconductor substrate. In this study, two types of optical setups, one based on a bundle of optical fibers and the other based on a binocular tube head, were developed to project a hybrid illumination of a modulated light beam and a ring-shaped constant illumination onto the sensor plate. An improved spatial resolution was realized by the ring-shaped constant illumination, which suppressed lateral diffusion of photocarriers by enhanced recombination due to the increased carrier concentration.

Original languageEnglish
Pages (from-to)1328-1333
Number of pages6
JournalSensors and Actuators, B: Chemical
Volume273
DOIs
Publication statusPublished - 2018 Nov 10

Keywords

  • Carrier diffusion model
  • Chemical imaging sensor
  • Light-addressable potentiometric sensor
  • Spatial resolution

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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