Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 16, Issue 38, Pages 20329-20337Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cp01883d
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Funding
- Deutsche Forschungsgemeinschaft (DFG)
- Max Planck Research Group by the Max Planck Society
- Chemical Industry Fund (FCI) for the Hoechst Dozentenpreis of the Aventis Foundation
- Thuringer Landesgraduiertenschule fur Photovoltaik (PhotoGrad)
- Max Planck Society
- Humboldt Foundation
- Netherlands Organization for Scientific Research (NWO)
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Charge generation and recombination processes occurring in ternary photoactive copolymer:copolymer: fullerene blends consisting of different mixing ratios between entirely amorphous and semi-crystalline PPE-PPV copolymers are investigated by transient absorption pump-probe and pump-push photocurrent spectroscopy. The experiments reveal that an excess of semi-crystalline polymer facilitates exciton dissociation into free charge carriers, slows down geminate recombination, and suppresses non-geminate recombination leading to increased short-circuit currents and high fill factors. In contrast, blends utilizing solely the amorphous polymer for their donor phase suffer from a large fraction of sub-nanosecond geminate recombination of interfacially bound charge-transfer states and also from fast non-geminate recombination of free charges, resulting in a significantly reduced photovoltaic performance. However, small fractions of the amorphous polymer blended into the semi-crystalline polymer increase the open-circuit voltage and the fill factor, while keeping the charge generation and recombination parameters largely unaltered in turn leading to an optimized device performance for the ternary PPE-PPV copolymer: copolymer: fullerene blends.
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