Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (9): 20230180.doi: 10.7503/cjcu20230180

• Article • Previous Articles     Next Articles

Effect of Substitution Positions of Alkyl Chains in Small Molecular Donor Bridged Units on the Performance of Photovoltaic Devices

GUO Ziqi1, JIAO Cancan1, WU Simin1, MENG Lingxian2(), SUN Yanna1, KE Xin1, WAN Xiangjian1(), CHEN Yongsheng1()   

  1. 1.Key Laboratory of Functional Polymer Materials,Ministry of Education,College of Chemistry,Nankai University,Tianjin 300071,China
    2.School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China
  • Received:2023-04-07 Online:2023-09-10 Published:2023-05-29
  • Contact: MENG Lingxian, WAN Xiangjian, CHEN Yongsheng E-mail:lxmeng@zzu.edu.cn;xjwan@nankai.edu.cn;yschen99@nankai.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(52025033);the China Postdoctoral Innovative Talent Support Program(BX20220274)

Abstract:

Two isomeric small molecule donors, C2-C-F and C2-M-F, with only the different substitution positions of the alkyl chains on the intermediate bridged trithiophene units, were designed and synthesized. It was found that the alkyl chain substitution position has little effect on their absorptions and energy levels, but has a significant impact on the morphology of the active layers when blended with the acceptor BTP-4F-12. Better morphology was obtained for the active layer based on small molecule donor C2-C-F, and an efficiency of 12.84% was achieved for the C2-C-F-based photovoltaic device. This result indicates that the morphology of the active layer can be finely regulated through the alkyl substitution positions, providing a useful avenue for the design of efficient small molecule donors.

Key words: All-small-molecule organic solar cell, Alkyl chain, Small molecule donor

CLC Number: 

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