Halogen-free Polymer Donors Based on 3,4-Dicyanothiophene for High-performance Polymer Solar Cells

Yun-Li Zhao; Yue Zhang; Xi-Yue Yuan; Wan-Yuan Deng; Bo Zhang; Shu-Ting Pang; Bing-Yan Yin; Hong-Bin Wu; Kai-Wen Lin; Zhi-Tian Liu; Chun-Hui Duan; Fei Huang; Yong Cao

doi:10.1007/s10118-022-2721-5

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Halogen-free Polymer Donors Based on 3,4-Dicyanothiophene for High-performance Polymer Solar Cells

RESEARCH ARTICLE | Updated：2022-07-21

- Halogen-free Polymer Donors Based on 3,4-Dicyanothiophene for High-performance Polymer Solar Cells
- Halogen-free Polymer Donors Based on 3,4-Dicyanothiophene for High-performance Polymer Solar Cells
- Chinese Journal of Polymer Science 2022年40卷第8期页码：905-913
- Affiliations：
  
  a.Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
  b.Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials, Wuhan Institute of Technology, Wuhan 430205, China
  c.Department of Materials and Food, University of Electronic Science and Technology of China Zhongshan Institute, Zhongshan 528402, China
- Author bio：
  
  kevinlin1990@163.com (K.W.L.)
  able.ztliu@wit.edu.cn (Z.T.L.)
  duanchunhui@scut.edu.cn (C.H.D.)
- Funds：
  
  The work was financially supported by the Ministry of Science and Technology of China (Nos. 2017YFA0206600 and 2019YFA0705900), the National Natural Science Foundation of China (Nos. 21875072, U20A6002 and 51973169), and Guangdong Innovative and Entrepreneurial Research Team Program (No. 2019ZT08L075). This study also received financial support from Science and Technology Foundation of Guangdong Province (No. 2021A0101180005), and Special Projects in Key Areas for the University of Guangdong Province (No. 2021ZDZX1009).
- DOI：10.1007/s10118-022-2721-5
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Yun-Li Zhao, Yue Zhang, Xi-Yue Yuan, 等. Halogen-free Polymer Donors Based on 3,4-Dicyanothiophene for High-performance Polymer Solar Cells[J]. Chinese Journal of Polymer Science, 2022,40(8):905-913.

Yun-Li Zhao, Yue Zhang, Xi-Yue Yuan, et al. Halogen-free Polymer Donors Based on 3,4-Dicyanothiophene for High-performance Polymer Solar Cells[J]. Chinese Journal of Polymer Science, 2022,40(8):905-913.
Yun-Li Zhao, Yue Zhang, Xi-Yue Yuan, 等. Halogen-free Polymer Donors Based on 3,4-Dicyanothiophene for High-performance Polymer Solar Cells[J]. Chinese Journal of Polymer Science, 2022,40(8):905-913. DOI： 10.1007/s10118-022-2721-5.

Yun-Li Zhao, Yue Zhang, Xi-Yue Yuan, et al. Halogen-free Polymer Donors Based on 3,4-Dicyanothiophene for High-performance Polymer Solar Cells[J]. Chinese Journal of Polymer Science, 2022,40(8):905-913. DOI： 10.1007/s10118-022-2721-5.

摘要

A set of halogen-free polymers (PBCNT25, PBCNT50, and PBCNT75) based on 3,4-dicyanothiophene (DCT) have been constructed via ternary random copolymerization for high-performance polymer solar cells (PSCs). A remarkable efficiency of 15.7% has been achieved in PBCNT75:Y6-BO blend, which is one of the best results achieved by halogen-free polymers.

Abstract

Polymer solar cells (PSCs) consisting of a polymer donor and a small molecular acceptor is a promising photovoltaic technology, whose device performance is determined by both polymer donor and small molecular acceptor. Halogen atoms such as fluorine or chlorine atoms were usually introduced onto the polymer donors to downshift the highest occupied molecular orbital (HOMO) energy levels and improve the open-circuit voltage (,V,OC,) of the PSCs. However, the introduction of the halogen atoms especially fluorine atoms greatly complicates the polymer synthesis. Herein, we report the use of a structural simple and easily synthesized building block, 3,4-dicyanothiophene (DCT), to construct a set of halogen-free polymer donors PBCNT,x, (,x,=25, 50, 75) ,via, ternary random copolymerization. The introduction of DCT units not only simplified the synthesis, but also downshifted the HOMO energy levels of the polymers and improved the ,V,OC, of PSCs effectively. Encouragingly, the PBCNT75 afforded a power conversion efficiency up to 15.7% with a ,V,OC, of 0.83 V, which are among the top values for halogen-free polymer donors. This work shows that the introduction of DCT units is a simple yet effective strategy to construct halogen-free and low-cost polymer donors for high-performance PSCs.

关键词

Keywords

Polymer solar cellsPolymer donorsHalogen-freeOpen-circuit voltageEnergy loss

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