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Tunable Electron Donating and Accepting Properties Achieved by Modulating the Steric Hindrance of Side Chains in A-D-A Small-Molecule Photovoltaic Materials

Modulation of the electron donating and accepting properties of organic semiconductors is an important topic in the field of organic photovoltaics. Although the small-molecule semiconductors (SMs) with an A-D-A structure can act as either electron donor or acceptor in organic photovoltaic (OPV) devices, the reason why molecules with similar conjugated structures play different roles remains unclear. In this work, we designed and synthesized two A-D-A SMs named BTCN-O and BTCN-M, which have an identical backbone and differ in the alkyl substitution position. BTCN-O and BTCN-M demonstrate similar optical absorption spectra in solution and molecular energy levels in a solid film. BTCN-O forms an ordered lamellar packed structure with compact π–π stacking, whereas BTCN-M demonstrates only a weak π–π stacking effect in solid film. We also investigated their photovoltaic properties by blending each with a polymer donor, PBDB-T, and a fullerene acceptor, PC71BM, and found that the electron donating and accepting...

Authors:   Delong Liu; Liyan Yang; Yang Wu; Xiaohui Wang; Yan Zeng; Guangchao Han; Huifeng Yao; Sunsun Li; Shaoqing Zhang; Yun Zhang; Yuanping Yi; Chang He; Wei Ma; Jianhui Hou
Journal:   Chemistry of Materials
Year:   2018
DOI:   10.1021/acs.chemmater.7b03142
Publication date:   16-Jan-2018
Facts, background information, dossiers
  • molecules
  • Energy
  • blending
  • absorption
More about American Chemical Society Publications
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