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采用阳极氧化法在钛基底上生长了一维高度有序TiO2纳米管阵列,并与CdSe四脚状晶体及CdSe量子点组装成一种新型的量子点敏化太阳能电池(QDSSCs)。该阵列结构为光生电子的传递提供了快速通道,CdSe四脚状三维空间结构增加了其吸附在TiO2纳米管阵列的稳定性。采用XRD,SEM和HR-TEM对阵列及CdSe四脚状和量子点进行了表征。考察了CdSe四脚状和量子点敏化纳米管阵列三电极电池结构的光电性能。XRD谱图表明TiO2的锐钛矿晶型特征峰没有发生变化,同时出现了一系列的CdSe六方晶型和立方晶型特征峰。SEM图表明所制备的TiO2具有高度有序的纳米管阵列结构,且孔径大小均一、约为120 nm,长度近13.8μm。TEM和HRTEM图表明CdSe量子点具有四脚结构,CdSe核的直径约为4.1 nm,臂宽约为3.1 nm,臂长约为16.0 nm。结果表明:通过四脚状CdSe修饰TiO2纳米管阵列基电极在可见光谱区域的吸收得到了明显增强;此外,在模拟太阳光(AM 1.5 100 mW.cm-2)的照射下,四脚状CdSe敏化比CdSe量子点敏化TiO2纳米管阵列三电极结构电池的光电转换效率高,它们分别为0.13%和0.30%。
One-dimensional highly ordered TiO2 nanotube arrays were grown on titanium substrates by anodization and assembled into CdSe tetrapod crystals and CdSe quantum dots to form a new kind of quantum dot sensitized solar cells (QDSSCs). The array structure provides a fast channel for the delivery of photogenerated electrons. The three-dimensional structure of the CdSe tetrapod increases the stability of the adsorbed TiO2 nanotube array. The array and CdSe tetrapods and quantum dots were characterized by XRD, SEM and HR-TEM. The photoelectric properties of CdSe tetrapod and quantum dot sensitized nanotube array three-electrode cell were investigated. The XRD patterns show that there is no change in the anatase crystal peak of TiO2, and a series of hexagonal and cubic crystal peaks appear. The SEM images show that the prepared TiO2 has a highly ordered nanotube array structure with a uniform pore size of about 120 nm and a length of about 13.8 μm. The TEM and HRTEM images show that the CdSe quantum dots have a tetrapod structure. The diameter of the CdSe core is about 4.1 nm, the arm width is about 3.1 nm, and the arm length is about 16.0 nm. The results showed that the absorption of tetrapod-like CdSe-modified TiO2 nanotube array electrode in the visible region was significantly enhanced. In addition, under the irradiation of simulated sunlight (AM 1.5 100 mW.cm-2), tetrapod-shaped CdSe Sensitization efficiency CdSe quantum dot sensitized TiO2 nanotube array three-electrode structure of the cell photoelectric conversion efficiency, they were 0.13% and 0.30%.