Fluorination Triggered New Small Molecule Donor Materials for Efficient As-Cast Organic Solar Cells

Yuting Yang, Kai Wang, Gongqiang Li*, Xueqin Ran, Xin Song, Nicola Gasparini, Qian Qian Zhang, Xue Lai, Xiao Guo, Fei Meng, Mengzhen Du, Wei Huang, Derya Baran

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


Solution-processable small molecules (SMs) have attracted intense attention due to their definite molecular structures, less batch-to-batch variation, and easier structure control. Herein, two new SM donors based on substituted isatin unit (DI3T, DI3T-2F) are synthesized and applied as electron donors with the mixture of PC71BM to construct organic photovoltaics. As a result, 5,6-difluoro isatin derivative (DI3T-2F) obtains a power conversion efficiency of 7.80% by a simple solution spin-coating fabrication process without any additives, solvent, or thermal annealing process. More intuitively, due to stronger intermolecular interaction and higher hole mobility after the incorporation of fluorine atoms in end units, the devices present good tolerance to active layer thickness. The results indicate that DI3T-2F shows promising potential for large-scale printing processes and flexible application of efficient small molecule organic solar cells.

Original languageEnglish (US)
Article number1801542
Issue number34
StatePublished - Aug 23 2018

Bibliographical note

Funding Information:
This work was financially supported by the National Key R&D Program of China (2017YFA0204704), the National Science Foundation of China (51773091, 61604069), Natural Science Foundation of Jiangsu Province (BK20171465, BK20150064), and the High Performance Computing Center of Nanjing Tech University supporting the computational resources; X.S. N.G., and D.B. acknowledge King Abdullah University of Science and Technology (KAUST) Solar Center Competitive Fund (CCF) for financial support. The authors thank the beamline BL16B1 (Shanghai Synchrotron Radiation Facility) for providing the assistance.

Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim


  • as-cast devices
  • fluorination
  • isatin (1H-indole-2,3-dione)
  • organic solar cells
  • small molecule donors

ASJC Scopus subject areas

  • Biotechnology
  • Chemistry(all)
  • Biomaterials
  • Materials Science(all)


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