Journal
SOLID STATE IONICS
Volume 150, Issue 1-2, Pages 157-166Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0167-2738(02)00272-2
Keywords
sensor; space charge; simulation; oxygen incorporation; mixed conductor
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The change of resistance of SnO2 upon the change of oxygen partial pressure-a well known sensor effect-is studied theoretically. A linearised drift-diffusion model is used. The boundary conditions are formulated in terms of reaction rate equations. Resistance vs. time curves as well as the evolution of the concentration profiles of electrons and oxygen vacancies are numerically calculated anti discussed. Analytical approximations are derived for the corresponding time constants. Relevance of the model for commercial sensors is discussed. (C) 2002 Elsevier Science B.V. All rights reserved.
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