Dynamics, Miscibility, and Morphology in Polymer-Molecule Blends: The Impact of Chemical Functionality
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AbstractIn the quest to improve the performance of organic bulk-heterojunction solar cells, many recent efforts have focused on developing molecular and polymer alternatives to commonly used fullerene acceptors. Here, molecular dynamics simulations are used to investigate polymer-molecule blends comprised of the polymer donor poly(3-hexylthiophene) (P3HT) with a series of acceptors based on trialkylsilylethynyl-substituted pentacene. A matrix of nine pentacene derivatives, consisting of systematic chemical variation both in the nature of the alkyl groups and electron-withdrawing moieties appended to the acene, is used to draw connections between the chemical structure of the acene acceptor and the nanoscale properties of the polymer-molecule blend. These connections include polymer and molecular diffusivity, donor-acceptor packing and interfacial (contact) area, and miscibility. The results point to the very significant role that seemingly modest changes in chemical structure play during the formation of polymer-molecule blend morphologies.
CitationDynamics, Miscibility, and Morphology in Polymer-Molecule Blends: The Impact of Chemical Functionality 2015:151022104025003 Chemistry of Materials
PublisherAmerican Chemical Society (ACS)
JournalChemistry of Materials