Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
In low-bandgap polymers the triplet state energy is usually lower than the energy of charge transfer states which makes recombination to triplet state energetically feasible. Triplet formation is believed to be largely responsible for degradation of polymer-fullerene solar cells but its formation mechanism is not fully understood.
In this work we use broadband transient absorption spectroscopy in the wavelength range of 600-1300 nm to spectrally separate the population dynamics of charge carriers and polymer triplet states in PTB7:PC71BM blends which are used as active layers in efficient solar cells. Trap-assisted recombination to the polymer triplet state is found to be the main loss mechanism at the typical solar conditions.
We compare the measured recombination rate with the encounter rate of non-geminate charge pairs which was estimated using Langevin model and time-dependent carrier mobility measured by integral-mode photocurrent. We find that the actual recombination rate is ~100 times smaller than the predicted Langevin rate. Our results suggest that formation of triplet states can be reduced by tuning the energetics of electron donor or/and acceptor.
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