THE EFFECT OF THE AMBIENT OXYGEN ON THE ELECTRICAL PROPERTIES OF AN EVAPORATED FILM OF PENTACENE

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Abstract
The "oxygen effect" on the dark current as well as that on the photocurrent was investigated using thin evaporated films of pentacene, 1,2-benzpentacene, 1,2,8,9-dibenzpentacene, 6,13-diphenylpentacene, and 5,7,12,14-tetraphenylpentacene. No oxygen effect could be detected in the dark current.From the photocurrent dependence on oxygen pressure and from the rate of photocurrent decay, it is concluded that additional charge carriers are produced on illumination by photoexcitation of a surface complex.