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JOURNAL OF APPLIED PHYSICS
Volume 110, Issue 9, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3658870
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A model for conductance in n-type non-degenerate semiconductors is proposed and applied to polycrystalline SnO2 used as a gas sensor. Particular attention is devoted to the fundamental mechanism of Schottky barrier formation due to surface states in nanostructured grains. Electrical and absorption infra-red spectroscopic analysis constitutes strong evidence for oxygen diffusion into the tin oxide grains. The model is then extended to include oxygen in-and out-diffusion. Thus, it is possible to explain the long-term resistance drift in oxygen for fully depleted grained samples in terms of tunneling through the double barrier. (C) 2011 American Institute of Physics. [doi:10.1063/1.3658870]
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