3 October 2005 Light harvesting and energy transfer in large multidomain molecules
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Light harvesting and energy transfer in two oligomer-dye assemblies has been investigated. In both cases the oligomer was a poly(terphenylenecyanovinylene) derivative while two different dyes was used, a porphyrin and an ionic dye. It is well known that the efficiency of solar cells consisting of a single homopolymer is limited. To increase overall efficiency different strategies have been used. One possible strategy aims at covalently linking different domains. With careful design, this type of assemblies is envisaged to show improved charge separation and charge transport properties. We have shown how photophysical measurements can be used to determine what happens to an exciton formed on any of the domains. From fluorescence and absorption measurements on the assemblies, along with model compounds, it was possible to quantify the number of excitons that are emitted (fluorescence), transferred between domains or lost in internal transfer processes. Both steady state and lifetime measurements were performed in solution and on solid films. The effect of acid was investigated in the cases of the oligomer-porphyrin assembly. We found that in solution the effect of acid was an increase in the time of energy transfer, probably due to acid induced structural change of the porphyrin moiety. It was possible to make LB-films of the ionic dye-assembly, which made it possible to investigate a monolayer of the assembly.
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Holger Spanggaard, Holger Spanggaard, Frederik C. Krebs, Frederik C. Krebs, Mikkel Jørgensen, Mikkel Jørgensen, Noemi Rozlosnik, Noemi Rozlosnik, Niels B. Larsen, Niels B. Larsen, Ole Hagemann, Ole Hagemann, } "Light harvesting and energy transfer in large multidomain molecules", Proc. SPIE 5938, Organic Photovoltaics VI, 59380V (3 October 2005); doi: 10.1117/12.613440; https://doi.org/10.1117/12.613440

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