Characteristics and behavior of electrodeposited surfactant phthalocyanine photovoltaic cells

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Abstract
The photovoltaic characteristics of Al/surfactant aluminum phthalocyanine (SlAlPc)/Ag cells are reported. The electrodeposition technique is used to plate S1AlPc. This technique could easily produce large size depositions of pigment. Maximum values of 0.7% for power conversion efficiency and 18% for quantum yield for charge production have been obtained at 638 nm and 4 μW cm−2 with a light exponent of 0.58 for the photocurrent. Photovoltaic properties decrease with time in the dark and under constant illumination. This behavior seems to be related to the presence of a hydrated aluminum oxide layer at the interface Al/S1AlPc and could be rationalized in terms of deeply trapped electrons in the oxide and on its surface. The decrease of the photovoltage and the photocurrent are calculated on the basis of the trapped electron hypothesis.