Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (9): 20230092.doi: 10.7503/cjcu20230092

• Article • Previous Articles     Next Articles

Aggregation Morphology of Perylene Bisimide Acceptors and the Role on Exciton Processes and Electron Transport in Organic Solar Cells

ZHANG Yu, CHEN Jiehuan, ZHOU Jiadong, LIU Linlin, XIE Zengqi()   

  1. State Key Laboratory of Luminescent Materials and Devices,Institute of Polymer Optoelectronic Materials and Devices,South China University of Technology,Guangzhou 510640,China
  • Received:2023-03-08 Online:2023-09-10 Published:2023-07-11
  • Contact: XIE Zengqi E-mail:msxiez@scut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21975076);the Key Laboratory of Luminescence from Molecular Aggregates of Guangdong Province, China(2019B030301003);the Science and Technology Projects in Guangzhou, China(202102020561)

Abstract:

Head-to-tail bonded perylene bisimide(PBI) dyads with different branched alkyl chains substituted at the terminal imide position show various stacking modes, which results in different effects on the excitonic processes and electron transportation. The dyad bearing branched alkyl chains with the branching sites close to the imide positions forms homogeneously amorphous state, while with branching sites being away from the imide positions the PBI core tend to stack with multiple modes. There are fewer energy trapping sites in the homogeneously amorphous state, but in the multiple stacking system the strong π-π interactions give more trapping sites. Our study demonstrates that the aggregation state of PBI-based acceptors plays an important role in the performances of organic solar cells(OSCs). Multiple stacking needs to be diminished to avoid the constrained exciton dissociation and retarded charge transport in the active layer.

Key words: Perylene bisimide, Amorphous state, Coexistence of multiple stacking, Organic solar cell

CLC Number: 

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