title: Azulene methacrylate polymers: synthesis, electronic properties, and solar cell fabrication.
abstract: We report the synthesis of novel azulene-substituted methacrylate polymers by free radical polymerization, in which the azulene moieties represent hydrophobic dipoles strung pendant to the polymer backbone and impart unique electronic properties to the polymers. Tunable optoelectronic properties were realized by adjusting the azulene density, ranging from homopolymers (having one azulene group per repeat unit) to copolymers in which the azulene density was diluted with other pendant groups. Treating these polymers with organic acids revealed optical and excitonic behavior that depended critically on the azulene density along the polymer chain. Copolymers of azulene with zwitterionic methacrylates proved useful as cathode modification layers in bulk-heterojunction solar cells, where the relative azulene content affected the device metrics and the power conversion efficiency reached 7.9%.
authors: Polymer Science and Engineering Department and ‡Department of Chemistry, University of Massachusetts Amherst , 120 Governors Drive, Amherst, Massachusetts 01003, United States.
authors: Egle
authors: E
authors: Puodziukynaite
authors: Hsin-Wei
authors: HW
authors: Wang
authors: Jimmy
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authors: Lawrence
authors: Adam J
authors: AJ
authors: Wise
authors: Thomas P
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authors: Russell
authors: Michael D
authors: MD
authors: Barnes
authors: Todd
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authors: Emrick