NO2 sensor based on InP epitaxial thin layers
1999
Abstract n-InP epitaxial thin layers are exposed to concentrations of a diluted oxidizing gas: NO 2 . In the presence of this gas, the resistance measured parallel to the surface of the InP layer, between ohmic contacts, increases. The magnitude of its variations depends on several parameters: the operating temperature, the thickness and the doping concentration level of the InP layer, and the gas concentration. A theoretical model of the action of the gas is proposed, mixing chemisorption equilibrium and surface field effect. The experimental results are in agreement with the theoretical predictions.
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