Transient Photoelectric Responses in Organic Dye Langmuir-Blodgett Films

Abstract

Schottky-type photoelectric cells with a photoconductive layer made of organic dye Langmuir-Blodgett films were fabricated to investigate transient photoelectric responses. Three types of amphiphilic merocyanine derivatives with different substituents were employed to investigate the effect of aggregate formation, and a lightly substituted copper phthalocyanine derivative was employed to investigate the influence of alkyl chains on the responses. Each cell showed dispersive conduction. The results suggest that alkyl chains dominate the conduction process rather than aggregate formation. In addition, the possible application of the dispersive conduction to a fractal device is also discussed based on the experimental results.