Microwave-assisted Preparation of Nanocrystalline TiO2 for Dye-sensitized solar cells

• Main Authors: Sin-Wei Lu, 呂信緯
• Other Authors: Chaochin Su
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/92x2c2

碩士 === 國立臺北科技大學 === 有機高分子研究所 === 98 === The dye sensitized solar cells (DSSCs) have attracted many industries and researchers because of their advantages such as low cost, flexible, and high conversion efficiency. Titanium dioxide (TiO2) is one of promising materials as a nano-porous thin film for working electrode in DSSCs, due to its appropriate energy band gap, dye adsorption ability, low cost, and easy preparation. This study developed a new method to prepare anatase TiO2 nanoparticles. By microwave technology, the dissolution of TiO2 precursor in sol-gel process is increased, which improves the hydrolysis efiiciency and fabricates anatase TiO2 with good crystal characteristic in combination with hydrothermal method. The influence of microwave power and treatment time on the crystal size and crystallinity of TiO2 nanoparticles is discussed in this study. The results show that anatase nano TiO2 with high specific surface area can be fabricated by microwave-hydrothermal process with 200 W microwave power and appropriate treatment time. Moreover, the size of TiO2 particles was unchanged even for more treatment time. Comparing to traditional hydrothermal process, new microwave-hydrothermal process decreases the synthesis time from five days to one day. Furthermore, the crystal structures and particle sizes are uniform by this method. Although photoelectron energy conversion for both TiO2 working electrodes, prepared by forgoing methods, was measured to be 6.9 %, microwave-hydrothermal TiO2 electrode inherited higher photo-to-current conversion, RK, and Ln. τ.