Slow transient photoresponse in Schottky-type junctions based on poly(4,4 ''-dipenthoxy-3 '-octyl-2,2 ': 5 ',2 ''-terthiophene)

We report a study of the slow transient phenomena observed, under continuous illumination, in the response of the sandwich-type structure indium-tin-oxide/poly(4,4"-dipenthoxy-3'-octyl-2,2':5',2"-terthiophene)/Al. The analysis of the transient component of the open-circuit voltage revealed that recombination processes are greatly enhanced under illumination, limiting the performance of this kind of devices.