Abstract
Interrupted hole transit experiments were carried out on dispersions of DEH, BD, and DBH in polycarbonate, using electron beam excitation. The sweep field was switched off for intervals between 10 ms and 10 s. On re-applying the field after more than 30 ms, the transit current initially rose to a value lower than that before interruption, but then gradually increased until holes began to arrive at the collecting electrode. The observations of a current plateau in uninterrupted transits, and of almost constant total charge collected irrespective of , suggest negligible deep trapping. The results seem incompatible with monoenergetic polaron transport, but can be understood on the basis of the Gaussian disorder model. When the field is switched off, the hole population `cools', slowly sinking into tail states. When the field is restored it is more quickly `re-heated' towards its original field-enhanced mean energy.
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