文摘
This article reports the synthesis of vertically oriented titanium dioxide nanorod (TiO2-NR) layer on fluorine doped tin oxide substrate using hydrothermal method and its application in solar energy harvesting. The morphological variations of TiO2-NR have been achieved by varying precursor concentration and growth temperature in the hydrothermal process. The porosity of TiO2-NR layer decreases from 49 to 11 % with increasing NR diameter from 70 to 204 nm for various practically achievable inter-rod separations. The effect of TiO2-NR layer parameters, such as, nanorod diameter, inter-rod separation, and porosity on the charge collection has been explored through theoretical and experimental photo-generated current density of the dye and perovskite (CH3NH3PbI3) solar cells to find the optimum range. High current density with a deviation of ±10 % of the best value can be achieved for a porosity range of 35–65 %, which corresponds to the nanorod diameter range of 75 ± 8, 95 ± 14, 110 ± 16, 130 ± 20 and 150 ± 22 nm for the inter-rod separation of 200, 250, 300, 350 and 400 nm respectively.