The optimum length of ZnO nanorods made by sol-gel and hydrothermal methods used in photoelectrochemical solar cells

In this research, the process of growth and the optimum length of ZnO nanorods has been studied as a subject of semiconductors, that are used in the photoelectrochemical solar cell made by Sol-Gel and Hydrothermal method.These Nano structures, having suitable gap, cause the decomposition of water into its constructing elements, hydrogen and oxygen.The most length of nanorods achieved by the FTO sublayer and deionized water solvent, at 95°C growth temperature, while 3 hours growing time, and on these conditions caused the length of nanorods to be 1500 nanometers, with the biggest length to width ratio 15.Also, at the final stage, photoelectrochemical experiments and the effects of nanorods length to the decompositionof water was studied. The results of photoelectrochemical experiments showed the optimum quantity for nanorods.The best result of photoelectrochemical has been reached to the maximum ratio of length to width 10, and the maximum length of nanorods 1000 nanometers that has been grown at the temperature of 95°C and during 2 hours.