Theory of power laws for semiconductor gas sensors

Noboru Yamazoe, Kengo Shimanoe

Research output: Contribution to journalArticlepeer-review

588 Citations (Scopus)


It has long been known empirically that the electric resistance of a semiconductor gas sensor under exposure to a target gas (partial pressure P) is proportional to Pn where n is a constant fairly specific to the kind of target gas (power law). This paper aims at providing a theoretical basis to such power laws. It is shown that the laws can be derived by combining a depletion theory of semiconductor, which deals with the distribution of electrons between surface state (surface charge) and bulk, with the dynamics of adsorption and/or reactions of gases on the surface, which is responsible for accumulation or reduction of surface charges. The resulting laws describe well sensor response behavior to oxygen, reducing gases and oxidizing gases.

Original languageEnglish
Pages (from-to)566-573
Number of pages8
JournalSensors and Actuators, B: Chemical
Issue number2
Publication statusPublished - Jan 15 2008

All Science Journal Classification (ASJC) codes

  • 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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