Preparation of nanocrystalline TiO2 films and their further modification with noble metal nanoparticles for Dye-Sensitized Solar Cell.

• Main Authors: Hsiaoting feng, 馮曉婷
• Other Authors: Lai-Kwan Chau
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/15383913839817542446

碩士 === 國立中正大學 === 化學所 === 97 === This thesis reports a synthetic route to nanocrystalline anatase TiO2 thin films, using triblock copolymer Pluronic P-123 as the template and Ti(OEt)4 as the inorganic precursor. The mesoporous TiO2 nanocrystals were synthesized by hydrolysis and aging of Ti(OEt)4 at 80 °C and -20 °C respectively, followed by crystal growth under hydrothermal conditions at 100 °C in an acid environment. The crystal phase, crystal shape, and surface area of the mesoporous TiO2 nanocrystalline material was characterized by XRD, SAXRD, TEM, HRTEM, SEM, and nitrogen adsorption (BET). The mesoporous TiO2 nanocrystalline material had a high surface area with a value of 83.12 m2/g and presented the existence of anatase crystal after removing the Pluronic P-123 template by high temperature calcination. In combination with a N719-sensitized mesoporous TiO2 photoanode and platinum counter-electrode, a photoelectric conversion efficiency of 2.5 % and 5.9 % under 1 sun illumination (100 mW/m2, air mass 1.5 G) for 0.6 μm and 6.9 μm film thickness, respectively, were achieved. Plasmon-induced photoelectrochemistry in the visible region was studied using noble maetal nanopaticles, such as gold and silver on mesoporous TiO2 photoanode. In this research, TiO2 films were modified with Au nanoparticles via a linker MPTMS as the photoanode. As a result, the short-circuit current was improved from 0.94 mA to 1.25 mA, fill factor increased from 0.53 V to 0.67 V, and conversion efficiency increased from 1.15 % to 2.09 %, and more than 28 % enhancement in the incident photon to current conversion efficiency (IPCE) at around 520 nm.