Effect of auxiliary on the properties of SnO_2 nano-cystalline prepared via hydrothermal method

摘要

The study of dye-sensitized solar cells (DSSCs) 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 DSSCs, the SnO_2 nano rots photocurrent is prepared via the hydrothermal method, and characterized by XRD, FESEM, HRTEM and Absorption spectrum. Though analysis the results, the conclusion is shown the better SnO_2 nano particles were prepared using the conditions that 0.05mol/L SnCl_4 concentration, the reaction time for 4 days, the molar ratio of salt and alkali for 1: 4, a holding temperature of 200°C, and the NaOH as auxiliary agent. The grain diameter of tin oxide is about 7 nanometers, and very uniform circular. SnO_2 nano particles has been quite clear, a large number of crystalline phase has been formed, and crystalline phase is very complete. The absorbance in the visible light range shows the very weak absorbance property.