Poly (o-methoxyaniline) (POMA) and poly(2,5-dimethoxyanitine) (PDMA) were used for fabricating Schottky diode devices with sandwich structure, as Al/POMA/indium tin oxide (ITO) coated glass and ITO/PDMA/Al. These devices exhibit rectifying behavior with differences in performance parameters like turn on voltage of the device, barrier height and saturation current density. A close comparison of the current (I)-voltage (V) characteristics reveals such differences. Cyclicvoltammetry and UV-Vis spectroscopy of POMA and PDMA films were used to obtain electrochemical and optical properties of the polymers and discussed in support of the observed differences in the electronic properties of the devices fabricated with POMA/PDMA. (C) 2003 Elsevier B.V. All rights reserved.