Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (9): 20230271.doi: 10.7503/cjcu20230271

• Article • Previous Articles     Next Articles

Alkyl Chain Engineering of Bithiophene Imide-based Polymer Donor for Organic Solar Cells

BAI Yuanqing, ZHANG Jiabin, LIU Chunchen(), HU Zhicheng, ZHANG Kai, HUANG Fei()   

  1. Institute of Polymer Optoelectronic Materials and Devices,State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangzhou 510640,China
  • Received:2023-06-06 Online:2023-09-10 Published:2023-07-29
  • Contact: LIU Chunchen, HUANG Fei E-mail:mscliu@scut.edu.cn;msfhuang@scut.edu.cn
  • Supported by:
    the National Key Research and Development Program of China(2019YFA0705900);the Basic and Applied Basic Research Major Program of Guangdong Province, China(2019B030302007);the National Natural Science Foundation of China(U21A6002);the Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials, China(2019B121205002)

Abstract:

Two polymer donor materials, namely pBDT-BTI-EH and pBDT-BTI-ME, were synthesized by copolymerizing benzodithiophene(BDT) unit with bithiophene imide(BTI) unit containing 2-ethylhexyl and methyl alkyl side chains, respectively. Compared to pBDT-BTI-EH∶Y6 based organic solar cells(OSCs), the pBDT-BTI-ME∶Y6-based device exhibited higher charge mobilities, reduced charge recombination, more efficient exciton dissociation, and favorable film morphology, which leaded to increased short current density(Jsc), fill factor(FF) and thus a significant improvement in power conversion efficiency(PCE) from 9.31% to 15.69%.

Key words: Organic solar cell, Polymer donor, Bithiophene imide, Alkyl chain engineering

CLC Number: 

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