The Au/chlorogallium phthalocyanine/Fe(CN)63-,4- photoconductor system was investigated by pulsed dye laser photocoulostatics. By variation of the direction and intensity of illumination, the Schottky barriers formed between the photoconductor dye and the contacting phases could be studied separately. The potential gradients at each interface were found to oppose one another such that a potential well formed in the dye layer, consistent with previous photocurrent spectroscopy studies The depth of this well was quantitated and the nonlinear potential gradients across the film defined for any bias potential This potential well decreases photoelectrochemical efficiencies in the Pc film by the trapping of mobile charges This effect is most pronounced when there is a large difference between the work function of the conductive substrate and the intrinsic Fermi level of the Pc layer.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry