Photoelectric Properties of Copper Phthalocyanine Langmuir-Blodgett Film

Abstract

Photovoltaic and structural characteristics of Langmuir-Blodgett film photocells have been studied using asymmetrically substituted copper phthalocyanine (asy-CuPc). By polarized-light absorbance measurements, each phthalocyanine molecule was found to be arranged in the film with its ring facing towards the dipping direction. The polarity of photoelectric characteristics showed typical features expected for an organic p-type Schottky diode, while the dark characteristics exhibited a reversed polarity. The maximum short-circuit photocurrent was on the order of 10^-8 A/cm² for 100 µW/cm² monochromatic light, indicating the superiority of asy-CuPc as a film-forming molecule for photovoltaic LB films.