State Key Laboratory of Fine Chemicals, DUT-KTH Joint Education and Research Centre on Molecular Devices, Dalian University of Technology (DUT), 2 Linggong Rd., 116024 Dalian (P.R. China), Fax: (+86) 411-84986250.
ChemSusChem. 2013 Dec;6(12):2322-9. doi: 10.1002/cssc.201300481. Epub 2013 Sep 13.
Three metal-free donor-acceptor-acceptor sensitizers with ionized pyridine and a reference dye were synthesized, and a detailed investigation of the relationship between the dye structure and the photophysical and photoelectrochemical properties and the performance of dye-sensitized solar cells (DSSCs) is described. The ionization of pyridine results in a red shift of the absorption spectrum in comparison to that of the reference dye. This is mainly attributable to the ionization of pyridine increasing the electron-withdrawing ability of the total acceptor part. Incorporation of the strong electron-withdrawing units of pyridinium and cyano acrylic acid gives rise to optimized energy levels, resulting in a large response range of wavelengths. When attached to TiO2 film, the conduction band of TiO2 is negatively shifted to a different extent depending on the dye. This is attributed to the electron recombination rate between the TiO2 film and the electrolyte being efficiently suppressed by the introduction of long alkyl chains and thiophene units. DSSCs assembled using these dyes show efficiencies as high as 8.8 %.
合成了三种带有吡啶离子和一种参比染料的无金属给体-受体-受体敏化剂，并详细研究了染料结构与光物理、光电化学性质以及染料敏化太阳能电池（DSSC）性能之间的关系。与参比染料相比，吡啶离子化导致吸收光谱红移。这主要归因于吡啶离子化增加了总受体部分的吸电子能力。引入吡啶翁和氰基丙烯酸酯等强吸电子单元，使能级得到优化，从而使波长响应范围变大。当这些染料附着在 TiO2 薄膜上时，TiO2 的导带根据染料的不同而不同程度地负移。这归因于长烷基链和噻吩单元的引入，有效地抑制了 TiO2 薄膜与电解质之间的电子复合速率。使用这些染料组装的 DSSC 的效率高达 8.8%。
