Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (9): 20230157.doi: 10.7503/cjcu20230157

• Article • Previous Articles     Next Articles

Efficient Organic Solar Cells Based on Acceptor1-acceptor2 Type Polymer Donor

LI Hao1,2, YANG Chenyi1,2, LI Jiayao2, ZHANG Shaoqing1,2(), HOU Jianhui1,2()   

  1. 1.School of Chemistry and Biology Engineering,University of Science and Technology Beijing,Beijing 100083,China
    2.State Key Laboratory of Polymer Physics and Chemistry,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China
  • Received:2023-04-01 Online:2023-09-10 Published:2023-07-06
  • Contact: ZHANG Shaoqing, HOU Jianhui E-mail:shaoqingz@ustb.edu.cn;hjhzlz@iccas.ac.cn
  • Supported by:
    the National Natural Science Foundation of China(22075017)

Abstract:

In this work, we designed and synthesized two wide band-gap polymer donors: poly{1,3-bis(2-ethylhexyl)-5-[5-(5'-methyl-4,4'-diundecyl-[2,2'-bithiazol]-5-yl)thiophen-2-yl]-7-(5-methylthiophen-2-yl)-4H,8H-benzo[1,2-c:4,5-c']dithiophene-4,8-dione}(PDTz-BDD) and poly(5-{4,8-bis[5-(2-ethylhexyl)thiophen-2-yl]-6-methylbenzo[1,2-b:4,5-b']dithiophen-2-yl}-5'-methyl-4,4'-diundecyl-2,2'-bithiazole)(PDTz-BDT). PDTz-BDT is a typical donor-acceptor(D-A) type copolymer, whereas PDTz-BDD is an acceptor1-acceptor2(A1-A2) type polymer. The photovoltaic properties of the two polymers were investigated by blending BTP-eC9 as the acceptor to construct organic solar cells, respectively. PDTz-BDD-based device achieves a higher power conversion efficiency of 10.36% due to its stronger light absorption ability, more obvious aggregation effect in solution and better morphological property of the blend film. This work not only demonstrates two novel donors, but also provides meaningful guidance for constructing A1-A2 type copolymers to develop efficient polymer donors in the future.

Key words: Polymer donor, Organic solar cell, Photovoltaic property, A1-A2 type structure

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