Applications of Meso-porous TiO2 thin Films and TiO2 powder for Dye-Sensitized Solar Cells

• Main Authors: Chien-Wen Tseng, 曾健文
• Other Authors: Yuan-yao Li
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/47398733133567462589

碩士 === 國立中正大學 === 化學工程所 === 97 === The study is mainly to investigate the effects of mesoporous TiO2 thin films and TiO2 nanoparticles on the performance of the dye-sensitized solar cells(DSSCs).The fabrication methods of mesoporous TiO2 thin films and TiO2 nanoparticles were of the simple, low cost, uniformly size, and highly thermal stable. The mesoporous TiO2 thin films and TiO2 nanoparticles can be directly formed by sol-gel method and evaporation -induced self-assembly method, respectively. By XRD, TGA, EDS, SEM and TEM analysis , TiO2 nanoparticles were confirmed as anatase phase, after calcination above 350℃, which is favorable to the performance of solar cells. By UV-vis and N2 adsorption/ desorption isotherm analysis, the band gap and the highest specific surface area of TiO2 nanoparticles were 3.2 eV and 194.36 (m2/g), respectively The mesoporous TiO2 thin films was applied as an interfacial layer between the TiO2 nanoparticles film and the FTO electrode in dye-sensitized solar cells. The introduction of mesoporous TiO2 thin films increased Isc from 0.48 to 1.65 mA/cm2. As a result, the photovoltaic conversion efficiency (η) was improved from 0.75% to 2.32%. In addition, the presence of interfacial organized mesoporous TiO2 provided excellent adhesion between the FTO IV and the TiO2 nanoparticles layer, suppressed the back-transport reaction by blocking direct contact between the electrolyte and FTO electrode. By increasing the thickness of the TiO2 nanoparticles layer from 1.2 μm to 12 μm, the the best efficiency of 5.027% can be achieved.