4.7 Article

Anthradithiophene-Containing Copolymers for Thin-Film Transistors and Photovoltaic Cells

Journal

MACROMOLECULES
Volume 43, Issue 15, Pages 6361-6367

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/ma1001639

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Funding

  1. Stanford Global Climate and Energy Project
  2. Air Force Office of Scientific Research
  3. Center for Advanced Molecular Photovoltaics [KUS-C1-015-21]
  4. King Abdullah University of Science and Technology (KAUST)
  5. 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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