Abstract
Abstract The polymer TQ1, (poly[2,3-bis-(3-octyloxyphenyl)quinoxaline-5,8-diyl-alt-thiophene-2,5-diyl]) is a popular candidate as donor in organic solar cells. A suitable acceptor molecule together with TQ1 is [6,6]-phenyl-C71-butyric acid methyl ester (PC70BM). We have studied films of TQ1 by fluorescence spectroscopy, with and without PC70BM, in solution and spin-casted from different solvents. The solvents used in this study were chloroform, chlorobenzene, and ortho-dichlorobenzene, while 1-chloronaphthalene was used as solvent additive. From a spectroscopic point of view, TQ1 acts as fluorescent probe and PC70BM as a fluorescence quencher. Lateral phase-separation occurs in the blend films and its magnitude depends on the solvent used. These morphological differences cause alterations in the fluorescence from TQ1. The degree of quenching is coupled to the morphology through the distance between TQ1 and PC70BM in the film.
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