Conduction mechanisms in printed thick-film resistors
C. Grimaldi, École Polytechnique Fédérale de Lausanne, Switzerland
The current theoretical understanding of the electron transport mechanism in thick-film resistors is reviewed and critically discussed in relation to the transport problem for other classes of conductor–insulator composites. The filler concentration and temperature dependencies of transport are analysed in terms of both percolation and tunnelling (i.e. hopping) processes. In particular, this chapter points out that, since inter-particle tunnelling is the predominant mechanism of transport in thick-film resistors, the percolation theory is not well suited to describe the filler concentration dependence of ...