1.3.5 Conduction Mechanism in Undoped and Antimony Doped SnO2 Based FSP Gas Sensors

Julia Rebholz, Carsten Jaeschke, Michael Hübner, Udo Weimar, Nicolae Barsan, David Pham & Lutz Mädler
The conduction mechanism in highly porous thick film SnO2 sensing layers, obtained by a direct deposition technique using FSP (Flame Spray Pyrolysis), and the influence of different antimony (Sb) doping levels on the electrical properties of the host material is investigated by simultaneous DC electrical resistance and work function changes measurements in various ambient atmospheres. The situation in the case of the undoped FSP-sensors is very similar to the results obtained on polycrystalline thick film...