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
- Chinese Journal of Polymer Science Vol. 40, Issue 8, Pages: 905-913(2022)
- 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：
- DOI：10.1007/s10118-022-2721-5
  CLC：
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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 40(8):905-913(2022)
DOI：

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 40(8):905-913(2022) 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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