New Random Copolymer Acceptors Enable Additive-Free Processing of 10.1% Efficient All-Polymer Solar Cells with Near-Unity Internal Quantum Efficiency

DOI Web Site 7 Citations 60 References
  • Nagesh B. Kolhe
    Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, Washington 98195-1750, United States
  • Duyen K. Tran
    Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, Washington 98195-1750, United States
  • Hyunjong Lee
    Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, Washington 98195-1750, United States
  • Daiki Kuzuhara
    Faculty of Science and Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate 020-8551, Japan
  • Noriyuki Yoshimoto
    Faculty of Science and Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate 020-8551, Japan
  • Tomoyuki Koganezawa
    Industrial Application Division, Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
  • Samson A. Jenekhe
    Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, Washington 98195-1750, United States

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Description

Finding effective molecular design strategies to optimize the active layer blend morphology is among the long-standing challenges in developing efficient all-polymer solar cells (all-PSCs). Here we show that new biselenophene/selenophene-linked naphthalene diimide random copolymer acceptors BSSx (x = 10, 20, 50) facilitate the achievement of high-performance all-PSCs without the use of any solution processing additive. Blends of BSS10 with donor polymer PBDB-T combined 10.1% power conversion efficiency with 97% internal quantum efficiency and 0.59 eV optical band gap energy loss (Eloss). BSS10- and BSS20-based devices have the best combination of high external quantum efficiency (>85%) and small Eloss (<0.6 eV) among all-PSCs yet reported. The results demonstrate that the blend morphology, charge carrier mobilities, and photovoltaic properties of all-PSCs could be rationally optimized by means of a synthetic variable—the random copolymer composition.

Journal

  • ACS Energy Letters

    ACS Energy Letters 4 (5), 1162-1170, 2019-04-11

    American Chemical Society (ACS)

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