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Schottky barriers of the type Au/polypyrrole/Al (or In) were made in sandwich configuration. The conductivity of polypyrrole was tuned to be on the order of 10 Ϫ3 ohm Ϫ1 cm Ϫ1 by its electrodeposition from a novel ambient temperature ternary eutectic melt consisting of acetamide, urea, and ammonium nitrate. The rectification characteristics were obtained from the current-voltage and capacitance-voltage measurements at room temperature. The analysis of data using thermionic emission theory gave improved values for the junction parameters of ideality factor, reverse saturation current, rectification ratio, and barrier potential when compared to the previously reported values for this polymer. Between Al and In metals used for the junction formation, the diode formed with Al metal is found to show better performance. The energy gap and work function of polypyrrole were also estimated.

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The time and temperature dependences of conductivity of four polymers namely polyindole, polyindole-5-carboxylic acid, polycarbazole, and poly(N-vinylcarbazole) are analysed to understand the aging process and conduction mechanism. The polymers are prepared electrochemically. The conductivity data obtained over a temperature range are fitted to Arrhenius and Mott equations. The thermal degradation of both doped and dedoped samples of the four polymers in air and N 2 atmosphere has been followed using thermogravimetric (TG) and differential thermal analysis (DTA). The thermal activation energies are evaluated by Horowitz and Metzger method.