Development of type-I/type-II hybrid dye sensitizer with both pyridyl group and catechol unit as anchoring group for type-I/type-II dye-sensitized solar cell
Development of type-I/type-II hybrid dye sensitizer with both pyridyl group and catechol unit as anchoring group for type-I/type-II dye-sensitized solar cell
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DOI：
10.1039/c6cp06513a
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发表时间：
2016-01-01
影响因子：
3.3
通讯作者：
Ohshita, Joji
中科院分区：
文献类型：
--
作者：
Ooyama, Yousuke;Furue, Kensuke;Ohshita, Joji
以吡啶基和邻苯二酚单元为锚定基团，合成了一种I/II型杂化染料敏化剂，并研究了其在染料敏化太阳能电池（DSSC）中的光伏性能。该敏化剂能够通过TiO 2表面刘易斯酸中心的配位键和B酸中心的双齿双核桥联键吸附在TiO 2电极上，这使得可以通过分子内电荷转移（ICT）激发将电子注入TiO 2电极的导带（I型途径）和通过染料至TiO 2电荷转移（DTCT）带的光激发（II型途径）。结果发现，吸附在TiO 2薄膜上的I/II型混合染料敏化剂具有宽的光吸收带，来自ICT和DTCT特性。在此，我们揭示了带有吡啶基和邻苯二酚单元的I/II型杂化染料敏化剂的物理和电化学性质，沿着其在TiO 2膜上的吸附模式，以及其在I/II型DSSC中的光伏性能，基于光学性质。（光吸收和荧光光谱）和电化学测量（循环伏安法）、密度泛函理论（DFT）计算、染料吸附在TiO 2膜上的FT-IR光谱、光电流-电压（I-V）曲线、入射光电流转换效率（IPCE）光谱、和电化学阻抗谱（EIS）。
A type-I/type-II hybrid dye sensitizer with a pyridyl group and a catechol unit as the anchoring group has been developed and its photovoltaic performance in dye-sensitized solar cells (DSSCs) is investigated. The sensitizer has the ability to adsorb on a TiO2 electrode through both the coordination bond at Lewis acid sites and the bidentate binuclear bridging linkage at Bronsted acid sites on the TiO2 surface, which makes it possible to inject an electron into the conduction band of the TiO2 electrode by the intramolecular charge-transfer (ICT) excitation (type-I pathway) and by the photoexcitation of the dye-to-TiO2 charge transfer (DTCT) band (type-II pathway). It was found that the type-I/type-II hybrid dye sensitizer adsorbed on TiO2 film exhibits a broad photoabsorption band originating from ICT and DTCT characteristics. Here we reveal the photophysical and electrochemical properties of the type-I/type-II hybrid dye sensitizer bearing a pyridyl group and a catechol unit, along with its adsorption modes onto TiO2 film, and its photovoltaic performance in type-I/type-II DSSC, based on optical (photoabsorption and fluorescence spectroscopy) and electrochemical measurements (cyclic voltammetry), density functional theory (DFT) calculation, FT-IR spectroscopy of the dyes adsorbed on TiO2 film, photocurrent-voltage (I-V) curves, incident photon-to-current conversion efficiency (IPCE) spectra, and electrochemical impedance spectroscopy (EIS) for DSSC.