Abstract
Photocurrents in anthracene and iodine which have been induced by high intensity flashes have heretofore been analyzed in terms of transient space-charge-limited current theory. Recent studies of the charge carrier generation process in anthracene single crystals suggest that this model may be unrealistic because the quantum efficiency of carrier generation approaches zero as the electric field vanishes. It is shown here that an alternative mechanism of charge transport, based on the migration of a charge sheet through the crystal, predicts transient photocurrents qualitatively similar to space-charge-limited currents. The charge-sheet theory is also applicable in the region of moderate intensity light pulses, which has not previously been treated. If the transient photocurrents which have been reported in iodine are analyzed by this transport mechanism, it is predicted that the quantum yield for carrier generation in iodine decreases markedly with decreasing electric field.
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