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Polaron recombination in pristine and annealed bulk heterojunction solar cells

2008; American Institute of Physics; Volume: 93; Issue: 16 Linguagem: Inglês

10.1063/1.3005593

1520-8842

Carsten Deibel, Andreas Baumann, Vladimir Dyakonov,

Quantum Dots Synthesis And Properties

We determined the dominant polaron recombination loss mechanism in pristine and annealed polythiophene:fullerene blend solar cells by applying the photoinduced charge extraction by linearly increasing voltage method in dependence on temperature. In pristine samples, we find a strongly temperature-dependent bimolecular polaron recombination rate, which is reduced as compared to the Langevin theory. For the annealed sample, we observe a polaron decay rate which follows a third order of carrier concentration almost temperature independently.