Abstract
Dark conductivity and photoconductivity in poly(p-phenylene-1,3,4-oxadiazole) (POD) films were investigated. Above 440 K, ionic conduction was observed. An electronic process which was delicately influenced by the presence of adsorbed oxygen was found below 440 K. Large photoconductivity was observed and its wavelength and temperature dependences were examined. POD films were pyrolyzed at the temperature between 670 and 810 K to give semiconductive polymer films with the conductivity between 10−20 and 10−5 S cm−1. Variations of dark conductivity, photoconductivity and charge drift mobility with pyrolysis were investigated. Charge drift mobilities of pyrolyzed POD films were around 10−7 cm2V−1s−1 and moderately dependent on the pyrolysis temperature.
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