Journal
MACROMOLECULES
Volume 44, Issue 8, Pages 2678-2684Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ma102566u
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Funding
- National Science Foundation [DMR-1005810]
- TORAY Industries, Inc.
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1005810] Funding Source: National Science Foundation
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Conjugated crystalline-crystalline donor- acceptor-donor block copolymer semiconductors, with regio-regular poly(3-hexylthiophene) as a donor (p-type) block and poly(pyridinium pheneylene) as an acceptor (n-type) block within the backbone, were produced by sequential Grignard metathesis synthesis of poly(3-hexylthiophene), a Yamamoto-type cross-coupling polymerization-cyclization sequence. These conjugated block copolymers are soluble in organic solvents and display broad optical absorption bands extending close to the near-infrared region. They show reversible ambipolar redox properties with high electron affinities of 3.8-4.0 eV as well as useful ionization potentials of 5.1 eV that are characteristic of the respective blocks. Block copolymers from p- and n-type organic semiconductors are of interest for the formation of nanostructured bulk heterojunctions in photovoltaic devices.
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