Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (7): 20230129.doi: 10.7503/cjcu20230129

• Article • Previous Articles     Next Articles

Benzotriazole-based Polymer Acceptors with Precise Structures for All-polymer Solar Cells

ZHANG Yue1, WU Baoqi1(), TIAN Shizeng1, HUANG Xuelong2(), LI Junyu3, PAN Langheng1, HUANG Fei1, CAO Yong1, DUAN Chunhui1()   

  1. 1.Institute of Polymer Optoelectronic Materials & Devices,State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangzhou 510640,China
    2.Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases,Ministry of Education,Gannan Medical University,Ganzhou 341000,China
    3.Institute for Complex Molecular Systems,Eindhoven University of Technology,Eindhoven 5600 MB,Netherlands
  • Received:2023-03-24 Online:2023-07-10 Published:2023-05-05
  • Contact: DUAN Chunhui E-mail:wubaoqilc@scut.edu.cn;huangxuelong@gmu.edu.cn;duanchunhui@scut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22275058);the National Key Research and Development Program of China(2019YFA0705900);the Guangdong Basic and Applied Basic Research Foundation, China(2022B1515120008);the Guangdong Innovative and Entrepreneurial Research Team Program, China(2019ZT08L075)

Abstract:

In this contribution, two polymer acceptors(PT1-γ and PT1-δ) based on benzotriazole(BTz) were designed and synthesized by regulating the polymerization sites. The effects of polymerization sites on the optical absorption, electrochemical energy levels, charge carrier mobility, and device performance of all-polymer solar cells (all-PSCs) were comprehensively investigated. Compared to PT1-δ, the polymer PT1-γ exhibited narrower optical bandgap and higher electron mobility. As a result, the PT1-γ-based all-PSC achieved a promising power conversion efficiency(PCE) of 11.92% with an open-circuit voltage of 0.89 V, a high short-circuit current density of 21.25 mA/cm2, and a fill factor of 0.63 when blended with PBDB-T, which is higher than 9.68% of the all-PSC based on PT1-δ. This work demonstrates that the polymerization site has a very significant effect on the optoelectronic properties of benzotriazole-based polymer acceptors. Therefore, regulating the polymerization sites of monomers is an effective design strategy for the development of high-performance polymer acceptors.

Key words: All-polymer solar cell, Polymer acceptor, Benzotriazole, Polymerization site

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