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Faculty for Biology, Chemistry, and Earth Sciences

Macromolecular Chemistry I:

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Fischer, F.; Hahn, T.; Bässler, H.; Bauer, I.; Strohriegl, P.; Köhler, A.: Measuring Reduced C60 Diffusion in Crosslinked Polymer Films by Optical Spectroscopy, Advanced Functional Materials, 24(39), 6172–6177 (2014) -- DOI: 10.1002/adfm.201401153
The diffusion of fullerenes such as C60 and PCBM in organic semiconductors is a key factor in controlling the efficiency of organic solar cells, though it is challenging to measure and to control. A simple optical method based on photoluminescence quenching is developed to assess the diffusion of a quencher molecule such as C60 through a semiconducting polymer film, in this case made with the polymer polyfluorene. When the mobility of the polymer chains is reduced by chemical crosslinking, the diffusion coefficient of C60 can be reduced by up to three orders of magnitude.
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