The Study Of Preparation And Application Of Sn_xTi_1-xO₂Nano-Semiconductor Materials

In this paper, a series of SnxTi1-xO2nanoparticles were prepared by sol-gel method. Using transmission electron microscope, scanning electron microscope, X-ray diffraction, nitrogen adsorption, ultraviolet visible diffuse reflectance spectra, X-ray photoelectron spectroscopy, differential thermal analysis, the morphology, structure, thermal and optical properties and surface properties of SnxTi1-xO2nanoparticles was characterized. By using SnxTi1-xO2nanoparticles as anode with three different dyes N719, N3and D205to prepare of dye sensitized solar cell, the performances of the batteries were tested. The results show that:1、The doping of Sn has obvious effect on promoting the transformation of TiO2from anatase to rutile. Increasing temperature is conducive to the transformation of anatase to rutile. With the doping content of Sn increasing, the progress of anatase to rutile structure is more and more obvious. Through literature research, we demand more research on anatase samples, so by differential thermal analysis the heat treatment temperature eventually is decided as450℃.2、 Under the present experimental conditions, with the doping molar ratio of Sn increasing from0to12%, the band gap value of samples decreased from2.95eV to2.25eV, and the specific surface area increased from31.96m2g-1to163.46m2g-1. Energy gap can promote the charge transfer and expand the absorption wavelength range, so the SnxTi1-xO2nanoparticles may be applied in photocatalysis, environmental pollution and solar cell and so on.3、Using the SnxTi1-xO2nanoparticles as anode with three kinds of dye N719, N3and D205as photosensitizer to assemble dye-sensitized cells. And it has carried on the related test. The anodic films of nanoparticles on ITO were seen by the SEM map and it can be observed that the film surface is smooth, dense graphs and no crack.4、With the increase of Sn doping content, The solar cells that SnxTi1-xO2as anode and N719as dye are obtained. The photoelectric conversion efficiency of the cells remains mostly unchanged, even slightly reduced. This may be due to doping later destroyed in a certain degree of pure TiO2hydroxyl, which leads to the decrease of adsorption capacity of chemical bond. The Ⅰ-Ⅴ parameter of solar cells that N3as a dye are obtained. With the increase of Sn content, the photoelectric conversion efficiency of the cell increased, and the band gap decrease, and nanoparticles size decrease, and the specific surface area increased. These performance characteristics have a certain relationship, but the overall efficiency is low. It may be due to poor response to600nm above N3spectra. Absorption spectra and the scope of the solar spectrum can not be well matched, so it cannot effectively use of this part of the light from the sun. The Ⅰ-Ⅴ parameter of solar cells that D205as a dye are obtained. With increasing of Sn doping content, the conversion efficiency of the solar cell in the continuous improvement. The solar cell doped Sn12%has efficiency of0.386%. This is higher than the first two dye N719, N3dye series battery efficiency, besides the structure characteristics and results of SnxTi1-xO2photoanodes trend agree.