高等学校化学学报 ›› 2023, Vol. 44 ›› Issue (7): 20230148.doi: 10.7503/cjcu20230148

• 研究论文 • 上一篇    下一篇

含9,10-二氟二噻吩并吩嗪杂环共轭聚合物的合成及有机太阳能电池性能

张泽升, 邓宇鑫, 孔令晨, 罗妹, 王新康, 张连杰, 陈军武   

  1. 华南理工大学高分子光电材料与器件研究所, 发光材料与器件国家重点实验室, 广州 510640
  • 收稿日期:2023-03-29 出版日期:2023-07-10 发布日期:2023-05-23
  • 通讯作者: 张连杰,陈军武
  • 作者简介:第一联系人:共同第一作者.
  • 基金资助:
    国家自然科学基金(22179040);国家重点研发计划项目(2019YFA0705900)

Synthesis of Difluorodithienophenazine Based Conjugated Polymers and Their Organic Photovoltaic Performance

ZHANG Zesheng, DENG Yuxin, KONG Lingchen, LUO Mei, WANG Xinkang, ZHANG Lianjie, CHEN Junwu   

  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:2023-03-29 Online:2023-07-10 Published:2023-05-23
  • Contact: ZHANG Lianjie, CHEN Junwu
  • Supported by:
    the National Natural Science Foundation of China(22179040);the National Key Research and Development Program of China(2019YFA0705900)

摘要:

设计具有稠环结构的缺电子单元是构筑高性能共聚物的有效策略. 本文合成了新的缺电子单元9,10-二氟二噻吩并吩嗪(DTPZ)单体, 并合成出两个新的聚合物PB-DTPZ和PFB-DTPZ. 对两个聚合物的光物理性能、 电化学性质、 有机光伏性能和活性层形貌等进行表征. 聚合物PB-DTPZ和PFB-DTPZ的光学带隙分别为1.70和1.68 eV, 相关的吸收光谱相较于常见的宽带隙聚合物有所红移. 聚合物PB-DTPZ和PFB-DTPZ具有较低的HOMO能级, 分别为‒5.51和‒5.68 eV, 说明DTPZ单元具有较强的吸电子能力. 得益于更加匹配的HOMO能级, 基于PB-DTPZ∶Y6的二元聚合物太阳能电池获得了12.13%的充电转换效率(PCE), 高于基于PFB-DTPZ∶Y6的二元器件. 将两个聚合物作为第三组分别分添加到PM6∶Y6体系中, 由于更深的HOMO能级以及互补的吸收, 使得基于PB-DTPZ和PFB-DTPZ的三元器件的PCE分别提升至17.08%和16.99%.

关键词: 稠环, 共聚物, 二噻吩并吩嗪, 聚合物太阳能电池

Abstract:

Designing electron-deficient unit based on fused ring is an effective strategy for constructing high-performance conjugated copolymers. In this work, a new electron-deficient monomer(DTPZ) with 9,10-difluorodithienophenazine as the core was synthesized, and two new polymers PB-DTPZ and PFB-DTPZ were prepared. The photophysical properties, electrochemical properties, and organic photovoltaic performance of the two polymers as well as their active layer morphologies were studied and analyzed. Polymers PB-DTPZ and PFB-DTPZ possess optical band gaps of 1.70 and 1.68 eV, respectively, showing red-shifted absorption spectra compared with common wide band gap polymers. The PB-DTPZ and PFB-DTPZ also show low-lying HOMO energy levels of ‒5.51 and ‒5.68 eV, respectively, suggesting the electron-deficient feature of DTPZ. Thanks to the more matched HOMO energy level to Y6 acceptor, the PB-DTPZ∶Y6-based binary polymer solar cell can achieve a power conversion efficiency(PCE) of 12.13%, which is higher than that(10.4%) of the PFB-DTPZ∶Y6-based binary device. Due to the deeper HOMO levels and complementary absorption spectra of PB-DTPZ and PFB-DTPZ, the addition of the two polymers as the third component to the PM6∶Y6 system can further improve the PCE, and the resulting ternary devices can deliver PCEs of 17.08% and 16.99%, respectively.

Key words: Fused ring, Copolymer, Difluorodithienophenazine, Polymer solar cell

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