Cu掺杂TiO2纳米晶粉体的形态及光电性能研究

Study on Morphology and Photoelectric Properties of Cu-doped TiO2 Nanocrystalline Powders

摘要:

TiO2纳米材料良好的光电性能,为其作为制备染料敏化太阳电池等新型太阳电池的光阳极材料提供了很好的应用基础。采用溶胶-凝胶法成功制备了Cu掺杂的TiO2纳米晶粉体,并利用XRD、EDS、TEM以及荧光分光光度计对样品进行了表征,研究了Cu掺杂对TiO2的物相类型、微观结构、晶粒尺寸以及光致发光性能的影响。结果表明,Cu掺杂使Cu2+取代Ti 4+进入TiO2的晶格中,在抑制TiO2晶粒生长的同时促进了TiO2的晶型转变,但这种抑制和促进作用会随着Cu掺杂量的增加而减弱。3%（原子分数）的Cu掺杂能够有效增强TiO2对光生电子的捕获能力,降低光生电子的复合速率,优化其光电性能。

Abstract:

The good photoelectric properties of TiO2 nanomaterials provide a good basis for its applications as a photoanode material for new solar cells such as dye-sensitized solar cells. In this paper, Cu-doped TiO2 nanocrystalline powders were successfully prepared by sol-gel method. The samples were characterized by XRD, EDS, TEM and fluorescence spectrophotometer. The effects of Cu doping on the phase type, microstructure, grain size and PL properties of TiO2 powders were investigated. The results show that Cu doping leads Cu2+ to replace Ti4+ into the crystal lattice of TiO2 and inhibits the growth of TiO2 crystal and promotes the crystal transition of TiO2, but this inhibition and promotion function will be weakened with the increase of Cu doping amount. 3%(atomic fraction) Cu doping can effectively enhance the capture ability of TiO2 to photoelectrons, reduce the recombination rate of photoelectrons and improve its photoelectric properties.