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Spatially resolved spectral mapping of phase mixing and charge transfer excitons in bulk heterojunction solar cell films
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Donor-acceptor phase mixing and charge transferexcitons (CTXs) in bulk heterojunction solar cell films have been imaged using confocal photoluminescence(PL) and Raman microscopy. Spatially resolved spectral analysis of PL was used to map fullerenediffusion and agglomeration as well as detect local changes in interfacial contact between donor and acceptor domains due to thermal annealing. CTX emission was most intense at the periphery of micron-sized fullerene agglomerates, which correlates with fullerene depletion in the surrounding film. Raman scattering indicates that the polymer phase is essentially immobile during the annealing process and that fullerene agglomerates reside atop a polymer-rich underlayer.
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