Journal
MACROMOLECULES
Volume 43, Issue 15, Pages 6361-6367Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ma1001639
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Funding
- Stanford Global Climate and Energy Project
- Air Force Office of Scientific Research
- Center for Advanced Molecular Photovoltaics [KUS-C1-015-21]
- King Abdullah University of Science and Technology (KAUST)
- Agency of Science, Technology and Research of Singapore
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We synthesized anthradithiophene-cyclopentadithiophene conjugated copolymers via Stille coupling. The anthradithiophene core was verified to be superior in stability compared to pentacene toward Diels-Alder cycloaddition and therefore more compatible with fullerenes, acceptor material commonly used in bulk heterojunction (BHJ) photovoltaic cells. The polymers exhibit high film absorption coefficients of 10(5) cm(-1), an order of magnitude higher than previously reported anthradithiophene-dialkylfluorene copolymers. Short-circuit currents exceeding 5 mA/cm(2) and a BHJ device efficiency close to 1% were achieved when device morphology was improved with diiodooctane as a solvent additive. This is the highest power conversion efficiency achieved by an acene-containing polymer so far.
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