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Optical absorption properties of SnO_2 and ZnO co-doped TiO_2 film

Gao Yanmin,Yang Zhilei,Lü Weigang,Tao Zhengzhang(School of Material Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang Jiangsu 212003,China)  
The wide forbidden band gap has affected the development of TiO2 semiconductor materials,which leads to low utilization of solar energy.By co-doping Sn and Zn elements,the light absorption properties of TiO2 thin film will be improved effectively.The experiment scheme about the optimal sol-gel is put forward according to orthogonal design.The best anatase TiO2 thin film was prepared at the element molar ratio 1.0∶1.5∶10 of tin,zinc and titanium,with the pH value 2.Compared with pure TiO2,co-doped TiO2 had 85nm red shift and declined its band gap.Under the circumtance that SnO2 and ZnO have no effect on TiO2 structure,XRD and SEM analysis showed that changing the way of crystallization,graining refinement and changing morphology features and so on,would improve the light absorption properties of SnO2 and ZnO co-doped TiO2 thin film.
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