Effect of pH Value on the Properties of SnO_2 Nano-Cystalline for Dye Sensitized Solar Cells

摘要

The study of dye-sensitized solar cells (DSCs) based on nano-crystalline films of high band gap semiconductors is a progressive field of research that is being carried out by scientists in a wide range of laboratories. To improve the conversion efficiency of the DSCs, the SnO_2 nanorots photocurrent is prepared via the hydrothermal method, and characterized by XRD, FESEM, BET and Absorption spectrum. Though analysis the results, the conclusion is shown the pure SnO_2 is preparation, the SnO_2 nano-crystalline both shows the single phase that SnO_2 from the sule solution to kalin solution. The prepared SnO_2 nano-crystalline under pH=3 shows the particle-shape crystalline, the surface area of SnO_2 nano-crystalline is 86.3412m2/g. The prepared SnO_2 nano-crystalline under pH=7 shows the short rod-shape crystalline, the surface area of SnO_2 nano-crystalline is 58.3408m~2/g. The absorbance of SnO_2 nano-crystalline shows the strong absorption in the ultraviolet ray range, the absorbance of synthesized SnCh nano-crystalline under pH=11 shows the highest value.