PAni-PMMA blend/metal Schottky barriers

We report here the fabrication of Schottky barriers using polyaniline and insulating polymers like polymethylmethacrylate (PAni-PMMA) blends. The Schottky barriers were prepared by the thermal evaporation of gold metal electrodes on to free-standing films of the blends. The electrical characteristics of the barriers are found to depend on the work function of the PAni-PMMA blend, which in turn depend on the volume fraction of PAni. Current-voltage (I-V) and capacitance-voltage (C-V) measurements were used to characterize these devices. The values of various junction parameters such as ideality factor, barrier heights and rectification ratio were calculated. © 2002 Elsevier Science B.V. All rights reserved.