Photoinduced electron injection from organic dye having pyridyl anchor to Lewis Acid site of TiO2 surface
Photoinduced electron injection from organic dye having pyridyl anchor to Lewis Acid site of TiO2 surface
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具有吡啶基锚定的有机染料光致电子注入 TiO2 表面的路易斯酸位点
DOI：
10.1039/c5ra12616a
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发表时间：
2015
期刊：
影响因子：
3.9
通讯作者：
and J. Ohshita
中科院分区：
文献类型：
--
作者：
Y. Harima;Y. Kano;T. Fujita;I. Imae;Y. Ooyama;and J. Ohshita
具有吡啶基作为锚单元的有机染料（NI 4）仅吸附在TiO 2表面的刘易斯酸位点，尽管与具有锚定到布朗斯特酸位点的羧基的类似染料（NI 2）相比，其吸附能力非常弱。在本研究中，两个类似的染料，NI 2和NI 4，光伏特性进行了深入的研究，通过改变染料负载在TiO 2表面和照明光的强度。一个显着的发现是，在强烈的照明下观察到的光电流和光电压是更大的NI 4比NI 2，这表明染料到TiO 2表面上的吸附性不一定是一个主要因素，导致高的电子注入概率从染料到TiO 2。NI 2-和NI 4-DSSC之间的光伏功能的差异的合理原因进行了讨论的电化学阻抗谱和瞬态光电压测量的基础上。
An organic dye with a pyridyl group as an anchor unit (NI4) adsorbs exclusively at the Lewis acid sites of TiO2 surface, although its adsorbability is very weak compared with that of a similar dye with a carboxyl group anchoring to Brønsted acid sites (NI2). In the present study, photovoltaic features of two similar dyes, NI2 and NI4, are thoroughly investigated by changing dye loadings on TiO2 surface and the intensity of the illuminated light. A remarkable finding is that photocurrents and photovoltages observed under intense illumination are larger for NI4 than for NI2, suggesting that the adsorbability of dye onto a TiO2 surface is not necessarily a principal factor leading to a high electron injection probability from dye to TiO2. Plausible reasons for the difference in photovoltaic features between NI2- and NI4-DSSCs are discussed on the basis of electrochemical impedance spectroscopy and transient photovoltage measurements.