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Fluorination-substitution effect on all-small-molecule organic solar cells

  • Qiong Wu
  • Dan DengEmail author
  • Jianqi Zhang
  • Wenjun ZouEmail author
  • Yang Yang
  • Zhen Wang
  • Huan Li
  • Ruimin Zhou
  • Kun Lu
  • Zhixiang WeiEmail author
Articles Special Topic: Photovoltaics
  • 47 Downloads

Abstract

Due to the strong crystallinity and anisotropy of small molecules, matched molecular photoelectric properties and morphologies between small molecules and non-fullerene acceptors are especially important in all-small-molecule organic solar cells (OSCs). Introducing fluorine atoms has been proved as an effective strategy to achieve a high device performance through tuning molecular energy levels, absorption and assembly properties. Herein, we designed a novel benzodithiophene-based small molecule donor BDTF-CA with deep highest occupied molecular orbital (HOMO) energy level. All-small-molecule OSCs were fabricated by combing non-fullerene acceptor IDIC with different fluorine-atom numbers. Two or four fluorine atoms were introduced to the end-capped acceptor of IDIC, which are named as IDIC-2F and IDIC-4F, respectively. With the increase of fluorination from IDIC to IDIC-4F, the open circuit voltage (Voc) of the devices decreased, while hole and electron mobilities of the active layers increased by one order of magnitude. Contributed to the most balanced Voc, short-circuit current (Jsc) and fill factor (FF), the device based on BDTF-CA/IDIC-2F achieved the highest power conversion efficiency of 9.11%.

Keywords

organic solar cells all-small-molecule fluorination blend morphology energy levels 

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Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (51603051, 21534003), the Ministry of Science and Technology of China (2016YFA0200700, 2016YFF0203803), the Beijing Nova Program, the Youth Innovation Promotion Association, Chinese Academy of Sciences.

Supplementary material

11426_2018_9437_MOESM1_ESM.pdf (936 kb)
Fluorination-saturation effect on all-small molecule organic solar cells

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijingChina
  2. 2.University of Chinese Academy of SciencesBeijingChina
  3. 3.Sino-Danish CollegeUniversity of Chinese Academy of SciencesBeijingChina

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