ORGANOMETALLIC PHOTOCONDUCTORS - DARK AND PHOTOCONDUCTIVE STUDIES ON FERROCENE AND SOME OF ITS DERIVATIVES

The dark conduction properties of ferrocenedicarboxylic acid have been studied as a function of voltage at different sample-temperatures by using sandwich type of cell configuration. The analysis of the results was based on the space charge limited conduction (SCLC) theory. The trap distribution in this material has been found to be exponential type as was observed in case of ferrocene and ferrocenecarboxylic acid. The dark activation energy (ohmic) of these ferrocene derivatives increases with the gradual substitution of -COOH group in the ferrocene ring system. In contrast to the nonextrinsic nature of ferrocenecarboxylic acid, ferrocenedicarboxylic acid has been observed to be extrinsic, similar to ferrocene. The photoconductivity in these materials was studied as a function of temperature and the intensity of exciting light source. The distribution of traps in these materials has been determined from the intensity dependence of photocurrent and these results have been compared with the results of dark conductivity measurements.