Properties of junctions of crystalline networks of complex TCNQ salts in polymer matrix with silicon

The properties of junctions formed by conductive organic polymer composites with networks of two complex tetracyanoquinodimethane (TCNQ) salts (of N-n-butyl-isoquinolinium and of diethyl methyl sulphonium cations) with silicon were studied. We show that it is possible to prepare junctions with quite good rectifying properties, comparable to those using other organic semiconductors. The observed current-voltage characteristics can be satisfactorily fitted using the modified Schottky equation. C-V characteristics show that the transport mechanism, especially in the case of p-Si junctions is more complicated and probably tunnelling between localized levels plays an important role.