Fotovoltaik sistemler için nanomalzeme üretimi

Increasing energy demand and running out of fossil fuels led researchers to find alternative energy solutions. Solar cells are one of the most promising options in that field, because of the unlimited potential of solar power. Dye-sensitized solar cells (DSSCs) are under the class of the third generation solar cells. They have been studied widely since their invitation by Grätzel, because of their low cost and versatile technology. Here, a condense TiO2 film, usually made from nanosized TiO2, carries an organic dye. In this system, dye absorbs the light and carries excited electron into conduction band. For the sake of reduce irregular movement of the electrons, one-dimensional morhologies such as nanowires, nanorods and nanotbues have been synthesized as an option to nanoparticle based films. Due to having easy production methods and ordered geometric arrays, TiO2 nanotube (TNT) films became popular in this application area in recent years. In order to achieve reasonable convertion rates in solar cells, most of these researches deal with improving properties of TNT's such as surface area-to-volume ratio, length-to-diameter ratio, homogenous porosity, desired crystal structure, conductivity or reactivity values etc. For being relatively new discovered field, scientists need numbers of experiments to achieve desired optimized conditions of TNT's. In this research it is aimed to find out the relationship between temperature, type of TiO2 raw material, time, concentration of NaOH solution and physical and chemical properties of TNT's in hydrothermal synthesis. Rutile and anatase bulk TiO2, Degussa P25 and ultrasounded anatase TiO2 (which have been synthesized on previous studies) used as different TiO2 sources. Without using any Design of Experiment (DOE) software, there should be 44=256 experiments for investigation of four different parameters in four levels. Nevertheless the required number of experiment sharply decreases to 16 by applying Taguchi method. Properties of TNT's characterized by SEM, XRD and BET surface area analysis. Finally optimized conditions determined by Minitab Statistical Software. Key words: TiO2, solar cell, photovoltaics, TiO2 nanotube, Taguchi method