Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 150, Issue 1, Pages 330-338Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2010.06.065
Keywords
Tin oxide thin film; Oxygen vacancy; Gradient distribution model; Non-steady state; Time-dependent characteristics
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The model of gradient distributed oxygen vacancies is extensionally investigated Based on the dynamics of oxygen vacancies under diffusion and exclusion effects in cooling process. the steady state and non-steady state solutions of the diffusion equation of the vacancies are solved The transient distribution of oxygen vacancies is revealed during the idealized cooling process Ills concluded that the exclusion effect dominates the density distribution of oxygen vacancies throughout the crystallite The time-dependent expressions of potential barrier [qV(x,t)], film resistance (R) and response to reducing gases (S) are formulated on the basis of Schottky model and Poisson's equation The simulated gas sensing characteristics are in good correlation with experimental results The constants and variables ale estimated according to the correlation Presumptions and reservations of the present expressions are also discussed (C) 2010 Elsevier B V All rights reserved
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