Research And Preparation Nanosheets And Nanospheres Of Photoanodes For Dye Sensitized Solar Cells

Environmental pollution and energy crisis caused by the excessive use of fossilfuels prompted the search for new and renewable sources of energy. Solar energy asan inexhaustible, inexhaustible clean energy attracted much research interest. Solarcell was one of the effective ways of using solar energy. Dye-sensitized solar cell withlow cost, no pollution, simple manufacture technology became a hot research topic inthe photovoltaic field. TiO2photoanodes were an important part of dye-sensitizedsolar cells, which restricts the conversion efficiency of the cells. Increasing the dyeadsorption capacity, speeding up the optical transmission speed of electronic in theanodic films through changing TiO2morphology,crystallinity, crystal phase were inorder to improve the photoelectric conversion efficiency of the battery has becomethe research focus.In this paper, The TiO2nanosheets and hollow microspheres were preparedthrough alkaline hydrothermal method. In low concentration alkaline solution, thelarge specific surface area, high energy crystal face of the nanosheets which had goodelectron transfer properties and more dye adsorption capacity were obtained afterhydrochloric acid treatment. In the process of acid treatment, the presence of chlorideions affected the crystalline phase of TiO2, pure anatase phase TiO2changed into amixed crystal including anatase and rutile. Because of the difference of band gap, theenergy level difference caused by a small amount of doped rutile was in favor ofelectrons transmission in the photoanode film. When applied in DSCS, a betterphotoelectric performance can be obtained。By coating on SiO2microspheres, the nanosheets-based hollow spheres weresuccessfully prepared through hydrothermal reaction. The hollow spheres had a largespecific surface area and good light scattering effect which promoted thephotoelectric conversion efficiency of the dye-sensitized solar.