Abstract
Photovoltaic measurements
were made on vacuum-evaporated tetracene films sandwiched between an aluminium
and a gold electrode. For polychromatic illumination in air open-circuit
voltages of up to 1.2 V were observed with the gold electrode positive. The best
power conversion efficiency was better than 10-4%. Two modes of carrier
production were distinguished, the first resulting from photon absorption in
the first tetracene singlet-singlet electronic transition, and the second
associated with lower energy red light photons. ��� Persistent voltages were also found to be
generated in the dark, the magnitudes of both these and the photovoltages being
reversibly increased by the presence of air.
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