Conduction mechanism in semiconducting metal oxide sensing films: impact on transduction
N. Bârsan, M. Huebner and U. Weimar, University of Tübingen, Germany
This chapter gives an overview of the conduction mechanisms in semiconducting metal oxide (SMOX) sensing films and their impact on the transduction of surface chemistry into a measurable sensor signal (relative change of resistance). Following general discussion on the functioning of sensors based on SMOX porous, sensing films, modelling of the conduction in p- and n-type materials is performed. The theoretical results explain why the sensor signals are lower for p-type oxides when compared with n-type oxides. The modelling concepts are verified by applying them to experimental ...