掺铈氧化钛薄膜光吸收性能的研究

AAbsorption spectra of TiO2 films doped with cerium

摘要: 利用射频磁控溅射法制备出TiO2薄膜及不同掺Ce比的TiO2薄膜。用紫外-可见分光光度计对薄膜的透过率做了测定，结果显示在一定掺杂范围内随着掺Ce量的增加，薄膜的光学吸收边出现红移。计算发现通过CeO2的掺杂，氧化钛薄膜禁带宽度Eg由3.40eV减小至2.73eV，从而使吸收边由366nm红移至455nm处，增强了对可见光的吸收，这与CeO2在TiO2导带与价带间引入杂质能级有关。

Abstract: Different kinds of Ce-TiO2 films were fabricated by radio frequency reactive magnetron sputtering. Based on the transmittance spectra measured by UVVis spectrophotometer, it was found that optical absorption band exhibited a red shift with the increase of Ce/Ti doping ratio. Calculation results indicates the band gap energy (Eg) decreases from 3.40eV to 2.73eV with the absorption band shift from 366nm to 455nm, which results in more absorption of visual light. The impurity energy level Ce 4f plays an important role in the absorption of visual light.