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首页> 外文期刊>Chinese science bulletin >Interaction between tetrasulfophthalocyanines and colloidal titanium dioxide and photoelectric behavior on sensitized microporous TiO_2 electrodes
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Interaction between tetrasulfophthalocyanines and colloidal titanium dioxide and photoelectric behavior on sensitized microporous TiO_2 electrodes

机译：四硫代酞菁与胶体二氧化钛的相互作用及敏化微孔TiO_2电极的光电行为

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THE photosensitization of wide-band gap semiconductors using organic dyes is the subject of an intensive investigation due to its importance for solar energy conversion. However, the efficiency of such photovoltaic devices is rather low. The problemsarise primarily from the relatively low absorbance of monolayer of dyes adsorbed on a smooth surface. Thick dyes layers tend to increase the electrical resistance of these films, so the overall light to electric conversion efficiency decreases. Recently,Gratzel and collaborators described a dye-sensitized TiO_2 photoelectrochemical device using microporous TiO_2 electrode with a monolayer coating of ruthenium polypyridyl complex dye. Because of the high surface area of the TiO2 film and the characteristic spectral properties of the dye, the device harvests a high proportion of incident light and has a solar-to-electric conversion efficiency of 7%--12% comparable to amorphous-silicon cells. However, the ruthenium dye they used absorbs light around the500 nm region. The search for sensitizers that may harvest more energy available in the solar spectrum is of particular interest. Phthalocyanines possess intense absorption in the visible region and are stable toward heat and light so that they can be employed in the sensitization of semiconductor electrodes and particles. One of the important criteria for an efficient photosensitization is to adsorb the dyes on the semiconductor surface with an electrostatic or chemical interaction. In this note, we describe phthalocyanine and its gallium and titanium derivatives with a sulfonic group as the substituent that can interact with the TiO_2 surface and facilitate charge injection into the conduction band of the semiconductor. Interaction between the sensitizer and colloidal TiO_2 was probed with absorption and fluorometric spectroscopy. The apparent association constants for the association between colloidal TiO_2 and phthalocyanines were calculated. The photoelectric behavior of sensitized microporous TiO_2 electrode was studied, the photocurrent spectra were measured and the mechanistic aspects of the photosensitization process were studied .
机译：由于其对太阳能转换的重要性，因此使用有机染料对宽带隙半导体进行光敏化是一项深入研究的主题。然而，这种光伏装置的效率相当低。问题主要是由于吸附在光滑表面上的染料单层吸光度相对较低。较厚的染料层往往会增加这些薄膜的电阻，因此总的光电转化效率会降低。最近，Gratzel和合作者描述了一种染料敏化的TiO_2光电化学装置，该装置使用了微孔TiO_2电极和钌多吡啶基络合物染料的单层涂层。由于TiO2膜的高表面积和染料的特征光谱特性，该设备可捕获高比例的入射光，并且与非晶硅相比具有7％-12％的太阳能转换效率细胞。但是，他们使用的钌染料吸收了500 nm附近的光。寻找可以收集更多太阳光谱中可用能量的敏化剂是特别感兴趣的。酞菁在可见光区域具有强吸收性，对热和光稳定，因此可用于半导体电极和颗粒的敏化。有效光敏化的重要标准之一是通过静电或化学相互作用将染料吸附在半导体表面上。在本文中，我们描述了酞菁及其带有磺酸基的镓和钛衍生物，该取代基可以与TiO_2表面相互作用，并有助于电荷注入半导体的导带中。敏化剂和胶体TiO_2之间的相互作用用吸收和荧光光谱法进行了探测。计算了胶体TiO_2与酞菁的缔合的表观缔合常数。研究了敏化微孔TiO_2电极的光电性能，测量了光电流谱，研究了光敏过程的机理。

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