Roles of shape and size of component crystals in semiconductor gas Sensors: I. Response to oxygen

Noboru Yamazoe, Kengo Shimanoe

Research output: Contribution to journalArticle

104 Citations (Scopus)

Abstract

An attempt to derive a comprehensive theory on the roles of shape and size of component crystals in semiconductor gas sensors is described. Based on Poisson's equations, the depth profiles of the electric potential inside the component crystals under electron-depleted conditions are solved for each shape of plate, sphere, or column. By combining this electronic equilibrium with the gas adsorption equilibrium taking place outside, the reduced resistance (R/ R0) of each sensor device can be expressed as a function of reduced adsorptive strength (y) of the adsorbing gas for crystals that are different in shape and are of a reduced size (n). As an important phenomenon typically associated with small crystals, a new type of depletion (volume depletion) appears following the conventional one (regional depletion) on increasing y, and the transition to volume depletion takes place at smaller y as n decreases. In the stage of volume depletion, R/ R0 is linear to y, with a linearity constant inversely proportional to n.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume155
Issue number4
DOIs
Publication statusPublished - 2008

Fingerprint

Chemical sensors
depletion
Semiconductor materials
Oxygen
Crystals
sensors
oxygen
gases
crystals
Gas adsorption
Poisson equation
Gases
linearity
Electrons
Sensors
Electric potential
adsorption
electric potential
profiles
electronics

All Science Journal Classification (ASJC) codes

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

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