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首页> 外文期刊>RSC Advances >Efficient dye-sensitized solar cell with a pure thin film of a hybrid polyoxometalate covalently attached organic dye as a working electrode in a cobalt redox mediator system
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Efficient dye-sensitized solar cell with a pure thin film of a hybrid polyoxometalate covalently attached organic dye as a working electrode in a cobalt redox mediator system

机译：高效的染料敏化太阳能电池，在钴氧化还原介体系统中，杂化多金属氧酸盐共价附着的有机染料的纯薄膜作为工作电极

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Polyoxometalates (POMs) are a class of inorganic metal-oxygen clusters comprising many elements, with unique structures and molecular weights, which possess similar energy band structures to metal oxides. In this research, for the first time, a Keggin-type hybrid polyoxometalate [SiW11O39(Si(CH2)(3)NH2)(2)O] (Hybrid-POM) is used as a pure semiconductor thin film in the working electrode of an efficient dye-sensitized solar cell (DSC) which was fabricated with a D35 organic dye as the sensitizer and a one-electron fast redox mediator cobalt complex. The D35 dye is attached to the surface of the POM by a strong amide bond (D35@Hybrid-POM). For comparison, two DSCs were also fabricated with mesoporous anatase TiO2, with and without a titania blocking layer, under the same conditions of electrolyte, sensitizer and counter electrode. J-V measurements of the DSCs were obtained under AM1.5G irradiation and photoelectrochemical parameters like open-circuit voltage (V-oc), short-circuit current density (J(sc)), fill factor (FF), voltage decay and the overall efficiency were measured and compared to the mesoporous titania cells. The J-V curves show a promising enhancement overall in the DSC with the D35@Hybrid-POM structure in comparison with other prevalent mesoporous titania cells. Incident photon to current conversion efficiency spectra of the D35@Hybrid-POM DSCs and mesoporous titania with TBL (titania blocking layer) working electrodes were also obtained. A maximum IPCE of about 91% was found for the DSC employing D35@ Hybrid-POM which is about 30% higher than the DSC with the mesoporous titania layer. The voltage decay measurements, calculated electron lifetime and effective recombination order (beta) showed that the electron lifetime becomes promisingly longer when we use the Hybrid-POM structure in the photoanode. Thus, these results show that the rates of recombination and electron transfer of the cobalt mediator system at the surface of Hybrid-POM are very slow.
机译：多金属氧酸盐（POM）是一类无机金属-氧簇，包含许多元素，具有独特的结构和分子量，其能带结构与金属氧化物相似。在这项研究中，Keggin型杂化多金属氧酸盐[SiW11O39（Si（CH2）（3）NH2）（2）O]（Hybrid-POM）首次用作纯的半导体薄膜。一种高效的染料敏化太阳能电池（DSC），它以D35有机染料为敏化剂和单电子快速氧化还原介体钴配合物制成。 D35染料通过牢固的酰胺键（D35 @ Hybrid-POM）连接到POM的表面。为了进行比较，在电解质，敏化剂和反电极的相同条件下，还制备了两种带有介孔锐钛矿型TiO2的，具有和不具有二氧化钛阻挡层的DSC。 DSC的JV测量是在AM1.5G辐照和光电化学参数（例如开路电压（V-oc），短路电流密度（J（sc）），填充系数（FF），电压衰减和总体效率）下获得的测量并与中孔二氧化钛细胞进行比较。与其他流行的介孔二氧化钛细胞相比，J-V曲线显示出具有D35 @ Hybrid-POM结构的DSC总体上有望实现增强。还获得了D35 @ Hybrid-POM DSC和具有TBL（二氧化钛阻挡层）工作电极的中孔二氧化钛的入射光子-电流转换效率光谱。使用D35 @ Hybrid-POM的DSC的最大IPCE约为91％，比具有中孔二氧化钛层的DSC高约30％。电压衰减测量，计算的电子寿命和有效重组阶数（β）表明，当我们在光电阳极中使用Hybrid-POM结构时，电子寿命有望变得更长。因此，这些结果表明，Hybrid-POM表面钴介体系统的重组和电子转移速率非常慢。

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