TiO_2纳米晶溶胶水热的合成及其染料敏化光电性能

Study on Sol-hydrothermal Synthesis of TiO_2 Nanoparticles and their Photoelectric Properties Sensitized by Dye

以异丙醇钛为前驱体,采用溶胶-水热方法合成了TiO2纳米晶.采用XRD和TEM等测试技术研究了合成条件对TiO2纳米晶的晶粒度、结晶度以及相转变的影响规律.研究显示,通过控制前驱液的预热处理、水热温度及前驱液浓度等条件,实现了对TiO2纳米晶的晶型、结晶度、晶粒度(10～20nm到120nm)的稳定调控.采用优化实验条件后得到的TiO2纳米晶的水性浆料,使用精确控制膜厚的涂布技术,制作成染料敏化太阳电池(Dye-Sensitized Solar Cells,DSSC).由于制备的TiO2纳米晶具有纯锐钛矿晶型、合适的晶粒大小和良好的结晶性,使DSSC的光电转换效率达到了7.33%,高于同样实验条件下以P25或商业TiO2浆料制作的DSSC的光电转换效率.

TiO2 nanopaticle was synthesised by sol-hydrothermal using titanium isopropoxide as the precursor.The effects of synthesis conditions on grain size,crystallinity and phase transformation between phase-pure rutile and phase-pure anatase,were analyzed by TEM and XRD.It was revealed that crystal-type,crystallinity and crystal-size（from 10-20nm to 120nm） of TiO2 nanoparticles could be controlled by the pre-thermal treatment,hydrothermal temperature and concentration of the precursor.A paste,made from the nanoparticles and water,and by a doctor-blade technology which could control the thickness of the film were utilized to make a Dye-Sensitized Solar Cell（DSSC）,which achieved a photoelectric conversion efficiency of 7.33%,as a result of the phase-pure anatase,appropriate grain size and favorable crystallinity of the TiO2 nanoparticles.It exceeded those DSSC＇s efficiencies made from the commercial paste or P25 paste.