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首页> 外文期刊>ACS applied materials & interfaces >Interplay between pi-Bridges and Positions of Branched Alkyl Groups of Unsymmetrical D-A-D-pi-A Squaraines in Dye-Sensitized Solar Cells: Mode of Dye Anchoring and the Charge Transfer Process at the TiO2/Dye/Electrolyte Interface
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Interplay between pi-Bridges and Positions of Branched Alkyl Groups of Unsymmetrical D-A-D-pi-A Squaraines in Dye-Sensitized Solar Cells: Mode of Dye Anchoring and the Charge Transfer Process at the TiO2/Dye/Electrolyte Interface

机译：在染料敏化太阳能电池中的非对称D-A-D-PI-A鳞片链的PI桥和支链烷基的位置的相互作用：染料锚定和TiO2 /染料/电解质界面的电荷转移过程

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Far-red-absorbing squaraines possessing high molar absorptivity (>10(5) M-1 cm(-1)) are being attracted as high-efficiency chromophores in dye-sensitized solar cells (DSSCs). A series of donor acceptor -donor-pi spacer-acceptor (D-A-D-pi-A) unsymmetrical squaraines, PSQ1-5, with indoline donor and squaric/cyanoacetic acid acceptor units, were designed for sensitized solar cells. For extending the absorption toward the near-infrared region (NIR) and controlling the orientation on the TiO2 surface, benzene (PSQ1 and PSQ2) and thiophene (PSQ3-5) 7r-spacers and out-of-plane branched alkyl groups at the indoline that are away (PSQ1, PSQ3, and PSQS) or near (PSQ2 and PSQ4) the anchoring group, respectively, were introduced. Dynamic aggregation tendency of PSQ1 and PSQ3 than that of their isomers systematically modulates the orientation on the TiO2 surface, which in turn enhances photovoltaic performance. Absorptance on a thin transparent TiO2 film shows a visible-to-NIR response with an onset around 800 nm for PSQ3-5. Although there is resemblance in electrochemical redox levels, their high injection efficiency and recombination resistance differentiated impact on the way of anchoring and the dihedral angle between D-A-D units and g-spacers. DSSCs sensitized with PSQS achieved a PCE of 8.15% under simulated AM 1.5G illumination (100 mW cm(-2)), with the current density (j) and open-circuit voltage (Voc) of 19.73 mA cm(-2) and 630 mV, respectively. A clear comparison of the incident-photon-to-current conversion efficiency versus the light-harvesting efficiency correlates the structure-property relationship with J obtained for PSQ dyes. Electrochemical impedance spectroscopy was carried out to examine the TiO2/dye/electrolyte interface for further confirmation of the enhanced PCE of top-se-alkylated PSQS over that of other dyes.
机译：具有高摩尔吸收率的远红吸收鳞片（> 10（5）m-1cm（-1））被吸引为染料敏化太阳能电池（DSSCs）的高效发色团。为敏化太阳能电池设计了一系列供体受体-Donor-PI间隔件（D-A-D-PI-A）不对称的鳞片，PSQ1-5，PSQ1-5，用吲哚供体和抗氰基乙酸受体单元设计。用于向近红外区域（NIR）的吸收延伸并控制TiO 2表面上的取向，苯（PSQ1和PSQ2）和噻吩（PSQ3-5）7R-间隔物和Indoline的外平面支链烷基。介绍了锚定组的（PSQ1，PSQ3和PSQs）或附近（PSQ2和PSQ4）。 PSQ1和PSQ3的动态聚集趋势与其异构体的动态聚集趋势系统地调节TiO2表面上的取向，这又提高了光伏性能。薄透明TiO2薄膜的吸收率显示出可见的至导液响应，对于PSQ3-5，发病率约为800nm。尽管在电化学氧化还原水平中具有相似性，但它们的高注射效率和重组电阻对锚固方式的影响和D-A-D单元和G-间隔物之间​​的撞击。用PSQ致敏的DSSCS在模拟的AM 1.5G照明（100mM cm（-2））下实现了8.15％的PCE，电流密度（j）和19.73 mA cm（-2）的开口电压（VOC）和分别为630 mV。清除光子到电流转化效率与光收集效率的明确比较将与PSQ染料的J的结构性关系相关联。进行电化学阻抗谱进行以检查TiO 2 /染料/电解质界面，用于进一步确认TOP-SE烷基化的PSQ的增强PCE在其它染料中的增强PCE。

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