高等学校化学学报 ›› 2011, Vol. 32 ›› Issue (6): 1343.

• 研究论文 • 上一篇    下一篇

染料敏化太阳能电池中具有不同电子给体的吩噻嗪类有机光敏染料的理论研究

张吉1,2, 李海斌2, 吴勇2, 耿允2, 段雨爱2, 廖奕1,2, 苏忠民2   

  1. 1. 首都师范大学化学系, 北京 100048;
    2. 东北师范大学化学学院, 功能材料化学研究所, 长春 130024
  • 收稿日期:2010-11-15 修回日期:2011-03-14 出版日期:2011-06-10 发布日期:2011-05-10
  • 通讯作者: 廖奕;苏忠民 E-mail:liaoy271@nenu.edu.cn;zmsu@nenu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 20903020)\, “长江学者和创新团队发展计划”项目(批准号: IRT0714)和国家“九七三”计划项目(批准号: 2009CB623605)资助.

TD-DFT Studies on Phenothiazine-based Dyes with Different Donor in Dye-sensitized Solar Cells

ZHANG Ji1,2, LI Hai-Bin2, WU Yong2, GENG Yun2, DUAN Yu-Ai2, LIAO Yi1,2*, SU Zhong-Min1*   

  1. 1. College of Chemistry, Capital Normal University, Beijing 100048, China;
    2. Institute of Functional Material Chemistry, College of Chemistry, Northeast Normal University, Changchun 130024, China
  • Received:2010-11-15 Revised:2011-03-14 Online:2011-06-10 Published:2011-05-10
  • Contact: LIAO Yi;SU Zhong-Min E-mail:liaoy271@nenu.edu.cn;zmsu@nenu.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 20903020)\, “长江学者和创新团队发展计划”项目(批准号: IRT0714)和国家“九七三”计划项目(批准号: 2009CB623605)资助.

摘要: 在染料敏化太阳能电池(DSSCs)中,染料影响着TiO2/染料/电解质等界面处的诸多重要的电子转移过程,从而影响电池总的能量转换效率. 为阐明D-π-A类光敏染料中,电子给体的不同所引起的能量转换效率的差异,本文采用密度泛函理论和含时密度泛函理论方法计算了两个最近合成的吩噻嗪类染料及其吸附到TiO2上后分子的基态和激发态光物理性质与热力学参数. 结果表明,电子给体的改变虽然没有明显的改变染料的光谱性质(垂直跃迁能和振子强度),却可以改变分子的前线轨道能级,进而影响染料分子的激子结合能Eb及激发态电子注入到半导体TiO2中的驱动力ΔGint的大小,并最终影响电池的能量转换效率. 因而本文指出了在今后有机光敏染料的合成设计上,除了关注重要的光谱性质外,也可以通过对染料分子结构的修饰来降低染料的激子结合能,同时提高染料激发态电子注入到半导体TiO2中的驱动力来改善电池的能量转换效率.

关键词: 吩噻嗪类染料, 电子给体, 垂直跃迁能, 激子结合能, 自由能, TD-DFT

Abstract: To shed light on the effects of the donor part in organic dyes on the energy conversion efficiency of dye-sensitized solar cells (DSSCs), Density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations were carried out to gain insights into the photophysical properties and the parameters of electron injection and transfer for the ground and excited states of phenothiazine-based dyes before and after binding to titanium dioxide(TiO2). The theoretical results reveal that the exciton binding energy Eb and the free energy change ΔGint for the electron injection of the dyes are crucial in determining the energy conversion efficiency of DSSCs when these dyes have the similar absorption spectra,i.e vertical transition energies and oscillator strength. We hope our conclusions would play a theoretical guiding role in the design and synthesize of new organic dyes.

Key words: Phenothiazine-based dyes, Donor, Vertical transition energy, Exciton binding energy, Free energy change, TD-DFT

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