α-thiophene octamer (α-8T) is shown to be a suitable materials for application as the p-type semiconductor component in photovoltaic devices. Combined with a perylene pigment as the n-type semicondctor, the α-8T is used to produce a pn heterojunction cell which exhibits a fill factor of 0.5 ad a conversion efficiency of 0.6% for irradiation of while light, a performance comparable to that reported for copper- and titanyl-phthalocyanine-based devices. The application of α-8T would allow vacuum deposition techniques to be used in the production of the cells.
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