Effect of Electrode Material on the Electrical Properties of Tin Dioxide Thick Films

Abstract

The influence of electrode material made of Ag-containing paste and Ni₃B-based paste on the properties of fine SnO₂ thick films is studied. The Sn_0.97Sb_0.03O₂ nanopowder is introduced into the thick-film composite to intensify the consolidation of the film during heat treatment, enhance its adhesion with the substrate, and control the resistivity. X-ray diffraction and electron microscopy are applied. The dependences of film resistivity on composition of the conducting phase are established. The effect of heat treatment temperature on the resistivity and current-voltage characteristics of films on silver and nickel contacts is examined. It is shown that the electrodes made of powdered Ni₃B paste can be used for Sn_O2 films whose heat treatment temperature does not exceed 1073 K, in particular, for gas sensors.