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Portrait of Arkady Yartsev. Photo: Kennet Ruona

Arkady Yartsev


Portrait of Arkady Yartsev. Photo: Kennet Ruona

The role of connectivity in significant bandgap narrowing for fused-pyrene based non-fullerene acceptors toward high-efficiency organic solar cells


  • Shungang Liu
  • Wenyan Su
  • Xianshao Zou
  • Xiaoyan Du
  • Jiamin Cao
  • Nong Wang
  • Xingxing Shen
  • Xinjian Geng
  • Zilong Tang
  • Arkady Yartsev
  • Maojie Zhang
  • Wolfgang Gruber
  • Tobias Unruh
  • Ning Li
  • Donghong Yu
  • Christoph J. Brabec
  • Ergang Wang

Summary, in English

Great attention has been paid to developing low bandgap non-fullerene acceptors (NFAs) for matching wide bandgap donor polymers to increase the photocurrent and therefore the power conversion efficiencies (PCEs) of NFA organic solar cells, while pyrene-core based acceptor-donor-acceptor (A-D-A) NFAs have been mainly reported via the 2,9-position connection due to their bisthieno[3′,2′-b']thienyl[a,h]pyrene fused via a five-membered ring bridge at the ortho-position of pyrene as the representative one named FPIC5, which has prohibited further narrowing their energy gap. Herein, an acceptor FPIC6 was exploited by creating the 1,8-position connection through fusing as bisthieno[3′,2′-b′]thienyl[f-g,m-n]pyrene linked at the bay-position via a six-membered bridge, with enhanced push-pull characteristics within such A-D-A structure. As a structural isomer of FPIC5, FPIC6 exhibited a much lower bandgap of 1.42 eV (1.63 eV for FPIC5). Therefore, the photocurrent and PCE of PTB7-Th:FPIC6 cells were improved to 21.50 mA cm-2 and 11.55%, respectively, due to the balanced mobilities, better photoluminescence quenching efficiency and optimized morphology, which are both ∼40% better than those of PTB7-Th:FPIC5 cells. Our results clearly proved that a pyrene fused core with 1,8-position connection with electron-withdrawing end groups instead of 2,9-position connection is an efficient molecular design strategy to narrow the optical bandgap and improve the photovoltaic performance of NFA based OSCs.


  • Chemical Physics
  • NanoLund: Center for Nanoscience

Publishing year







Journal of Materials Chemistry A





Document type

Journal article


Royal Society of Chemistry


  • Physical Chemistry
  • Condensed Matter Physics




  • ISSN: 2050-7488