影像科学与光化学 ›› 2018, Vol. 36 ›› Issue (1): 73-81.DOI: 10.7517/j.issn.1674-0475.2018.01.007

• 论文 • 上一篇    下一篇

基于吩噻嗪供体的敏化染料的合成及其光电性质

黄甜1,2, 魏怀鑫1,2, 沈菁华3, 刘娅静1,2, 程宏英1, 汲中玲1, 赵鑫1,2   

  1. 1. 苏州科技大学 化学生物与材料工程学院, 江苏 苏州 215009;
    2. 江苏省环境功能材料重点实验室, 江苏 苏州 215009;
    3. 苏州科技大学 数理学院, 江苏 苏州 215009
  • 收稿日期:2017-01-06 修回日期:2017-04-17 出版日期:2018-01-15 发布日期:2018-01-15
  • 通讯作者: 赵鑫
  • 基金资助:
    江苏省教育厅科技项目(311312310)、苏州市应用基础研究计划项目(SYG201440,SYN201415)和国家级大学生创新创业训练计划项目(201510332012Z)资助

Synthesis and Photoelectric Properties of Dye Sensitizers Based on Phenothiazine as Donor

HUANG Tian1,2, WEI Huaixin1,2, SHEN Jinghua3, LIU Yajing1,2, CHENG Hongying1, JI Zhongling1, ZHAO Xin1,2   

  1. 1. School of Chemistry Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu, P. R. China;
    2. Jiangsu Key Laboratory of Environmental Functional Materials, Suzhou 215009, Jiangsu, P. R. China;
    3. School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu, P. R. China
  • Received:2017-01-06 Revised:2017-04-17 Online:2018-01-15 Published:2018-01-15

摘要: 以吩噻嗪为供体,设计并合成了具有D-A-π-A或D-π-A结构的有机敏化染料2-氰基-3-{5-[7-(10-己基吩噻嗪-3-基)-苯并[1,2,5]噻二唑-4-基]-2-噻吩基}-丙烯酸(CVBTP)和2-氰基-3-{5-[7-(10-己基吩噻嗪-3-基)-2-噻吩基}-丙烯酸(CVTP)。在结构表征的基础上,研究了结构变化对敏化染料的光物理性质、电化学性质和光伏性能的影响。结果表明,在染料CVTP的D-π-A结构链上插入受体苯并噻二唑单元,得到的具有D-A-π-A结构的染料CVBTP的带隙变小,共轭体系变大,光吸收性能得到明显提升。CVBTP、CVTP的HOMO能级分别为-4.83、-4.82 eV,LUMO能级分别为-2.85、-2.28 eV,均与常见电解质I-/I3-(-4.60 eV vs va-cuum)和TiO2导带能级(-4.40 eV vs vacuum)相匹配,都可用作DSSCs的敏化染料,但与CVBTP相比,CVTP具有更适合的LUMO能级和较好的光伏性能。

关键词: 敏化染料, 吩噻嗪, 苯并噻二唑, DSSCs

Abstract: Two organic dyes 2-cyano-3-(5-(7-(10-hexyl-10H-phenothiazin-3-yl)benzo[1,2,5]thiadiazol-4-yl) thiophen-2-yl) acrylic acid(CVBTP)and 2-cyano-3-(5-(10-hexyl-10H-phenothiazin-3-yl)thiophen-2-yl)acrylic acid (CVTP) were designed and synthesized for dye sensitized solar cells (DSSCs). The dyes are based on phenothiazine as donor with D-A-π-A and D-π-A formation, respectively. The effects of the dyes' molecular structure changes on the DSSCs performance were investigated systematically, along with their photophysical and photoelectrochemical properties. The results show that CVBTP which introduced an additional electron-deficient benzothiadiazole unit has lower band gap, larger conjugated system, and its light absorption performance is improved significantly. The HOMO energy levels of CVBTP and CVTP were -4.83 and -4.82 eV, their LUMO energy levels were -2.85 and -2.28 eV, which were matched with common electrolyte I-/I3-(-4.60 eV vs vacuum)and TiO2 conduction band energy level(-4.40 eV vs vacuum). Both of the dyes are available for DSSCs, but CVTP has a more suitable LUMO energy level and better performance of photovoltaic than CVBTP.

Key words: dye sensitizer, phenothiazine, benzothiadiazole, DSSCs