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Electrical and photoelectrical measurements are made on thin films of β‐cobalt phthalocyanine particles in Schottky junction cells. The results of current density‐voltage characteristics in dark at constant temperature are interpreted in terms of a space charge limited mechanism dominated by an exponential distribution of trapping levels. An analysis of the results enables the determination of the Fermi temperature of the trap distribution. The dependence of the photovoltaic parameters on pigment loading and polymer binder are investigated. Typical polymeric binders used throughout this study are polyvinylacetate (PVA) and polycarbonate (MK). The results show that the polymer has a strong effect on photocurrent generation efficiency in phthalocyanine composite type photovoltaic cell; polymers having a polar group seem desirable for improving the performance.

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