MOE Laboratory of Bioinorganic and Synthetic Chemistry/KLGHEI of Environment and Energy Chemistry, Lehn Institute of Functional Materials, School of Chemistry and Chemical Engineering, SunYat-Sen University, Guangzhou, 510275, China.
Phys Chem Chem Phys. 2013 Jul 28;15(28):11909-17. doi: 10.1039/c3cp51633d. Epub 2013 Jun 13.
Starburst triarylamine-based organic dyes (D1, D2, and D3) have been synthesized. For the three designed dyes, the starburst triarylamine group, thiophene (or 3,4-ethylenedioxythiophene), and cyanoacetic acid take the role of electron donor, π-conjugation bridge, and electron acceptor, respectively. These compounds are characterized by photophysical, electrochemical, and theoretical computational methods. Nanocrystalline TiO2-based dye-sensitized solar cells were fabricated using these molecules as light-harvesting sensitizers. The overall efficiencies of the sensitized cells range from 5.48 to 6.15%. It was found that the introduction of the EDOT group in D3 bathochromically extended the absorption spectra, resulting in a leap in the photovoltaic performance in comparison to D2. Incorporation of a hydrophobic carbazole-containing segment at D2 relative with D1 retarded the electron transfer from TiO2 to the oxidized dye or electrolyte, leading to an increase of electron lifetime.
已合成基于星爆三芳胺的有机染料（D1、D2 和 D3）。对于这三种设计的染料，星爆三芳胺基团、噻吩（或 3,4-亚乙基二氧噻吩）和氰基乙酸分别充当电子给体、π 共轭桥和电子受体。这些化合物通过光物理、电化学和理论计算方法进行了表征。使用这些分子作为光捕获敏化剂制备了基于纳米晶 TiO2 的染料敏化太阳能电池。敏化电池的整体效率范围为 5.48%至 6.15%。研究发现，D3 中 EDOT 基团的引入使吸收光谱红移，与 D2 相比，光伏性能有了显著提高。与 D1 相比，D2 中引入疏水性含咔唑片段会阻碍电子从 TiO2 转移到氧化态染料或电解质，从而增加电子寿命。
