In this paper the influence of TiO2/polymer (RR-P3HT) interface to photo generated charge carriers separation and recombination have been studied. The quantum efficiency and charge carrier recombination were studied in heterojunctions of TiO2 (prepared with porous or flat interface) and spin coated RR-P3HT polymer film using time of flight (TOF) and double injection (DoI) transient methods. From the shape of the TOF transients it was determined that the charge carrier generation is taking place in the vicinity of the TiO2/P3HT interface. Samples with porous TiO2 films show better charge carrier separation, but the deep trapping of charge carriers at the interface appear. The charge carrier recombination is trimolecular (Auger type recombination) with the similar values of recombination coefficients in both types of samples.
- charge carrier generation and recombination