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Achieving Highly Efficient Nonfullerene Organic Solar Cells with Improved Intermolecular Interaction and Open-Circuit Voltage.

  • Author(s): Yao, Huifeng
  • Ye, Long
  • Hou, Junxian
  • Jang, Bomee
  • Han, Guangchao
  • Cui, Yong
  • Su, Gregory M
  • Wang, Cheng
  • Gao, Bowei
  • Yu, Runnan
  • Zhang, Hao
  • Yi, Yuanping
  • Woo, Han Young
  • Ade, Harald
  • Hou, Jianhui
  • et al.
Abstract

A new acceptor-donor-acceptor-structured nonfullerene acceptor ITCC (3,9-bis(4-(1,1-dicyanomethylene)-3-methylene-2-oxo-cyclopenta[b]thiophen)-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d':2,3-d']-s-indaceno[1,2-b:5,6-b']-dithiophene) is designed and synthesized via simple end-group modification. ITCC shows improved electron-transport properties and a high-lying lowest unoccupied molecular orbital level. A power conversion efficiency of 11.4% with an impressive V OC of over 1 V is recorded in photovoltaic devices, suggesting that ITCC has great potential for applications in tandem organic solar cells.

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