THE FIELD-INDEPENDENT EARLY TIME DRIFT VELOCITY OF CARRIERS IN POLYDIACETYLENES - SOLITARY WAVE ACOUSTIC POLARON OR DISPERSIVE TRAP LIMITED TRANSPORT IN 1D

Current controversy concerning the nature of the motion of charge carriers in polydiacetylene single crystals is examined. New results using picosecond time-resolved photocurrents are able to distinguish whether the observed saturated drift velocity is due to the motion of a solitary-wave acoustic polaron or a carrier moving in a distribution of traps and barriers, and indicate the former case. The relevance of the Onsager geminate recombination theory in these materials is also demonstrated unequivocally.