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.
We propose a double injection current transient technique to study the charge carrier mobilities and recombination in
thin films of bulk heterojunction structures. This experimentally simple technique allows estimation of bimolecular
recombination coefficient and charge carrier mobility, either of a sum of electron and hole mobilities in double injection
into insulator mode, or the ambipolar mobility in semiconductor mode. The double injection current transient technique
is used to study RRPHT/PCBM bulk heterojunction solar cells, and the obtained results are compared with results obtained using TOF and CELIV techniques.
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