Preparation Of ZnO Nanostructure And Its Application On The Dye Sensitized Solar Cells

Here we synthesized the well vertical-orientated ZnO nanowire arrays by thermal evaporation. Besides, we realized the preparation of the ZnO/TiO2 core-shell nanostructure, using simple spin-coating the hydrolyzate and anneal. The morphology, structure and property of these samples were characterized in details through Scanning electron microscopy, high resolution transmission electron microscopy, X-ray diffraction and photoluminescence spectra. From the result of measurements, we have several conclusions as follows:(1) With the help of analyzing different preprocessing methods and the growth method, we realized the preparation of the well vertical-orientated ZnO nanowire arrays(2)We achieved the controllable growth of the ZnO nanowire array. If we changed the ZnO seed layer or the parameter of the growth, we can get different ZnO nanowire. We concluded that the seed layer played an important role on the diameter and the vertical-orientated direction of ZnO nanowire array, we also explained the mechanism.(3) We first used the sample spin-coating and anneal to realize the ZnO core shell nanostructure. This method was highly reproducible and can be applied to grow other core-shell materials.(4) TiO2 shell did an important role in improving the performance of the DSSCs. The overall conversion efficiency of the ZnO/TiO2 core shell cell can be attained to-3.0%, and it may be obviously increased by-50%compared with sample of only ZnO nanowire array sample. The most important reason may be attributed the potential field, which was formed by the different electron density in the two materials.