John D. Roehling, K. Joost Batenburg, F. Benjamin Swain, Adam J. Moulé and Ilke Arslan Three-Dimensional Concentration Mapping of Organic Blends Advanced Functional Materials 23
Mixtures of polymers and fullerenes (for use in solar cells) called bulk-heterojunctions (BHJs), exhibit some mutual solubility. Annealing causes the mixed regions of a BHJ to phase-segregate into its pure components, which can increase the overall device performance. By measuring the morphology of the pure and mixed regions in three dimensions, it is observed that after annealing, the remaining mixed region can allow a BHJ to more easily maintain an optimal morphology, demonstrating a possible method to increase device lifetimes.
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