Photoelectric Properties of Nano Composite Material Films TiO2/SnO2 Prepared by Co-Spraying Pyrolysis Method

Mixed films TiO2/SnO2 were prepared by co-pyrolysis method from solution mixture of TiCl4 and SnCl4 salts. Investigating results of X-ray diffraction showed that upon spray pyrolysis conditions were carried out, compounds of TiCl4 and SnCl4 are not affected each other. Thus, oxide material systems were created from pyrolysis TiCl4 and SnCl4 salts which are the mixed systems of nano composite shape. Special point of these films is that there are appearances of photoconductivity that depends strongly on ratio of initial materials and prepared temperatures. Absorptive spectrum UV – Vis and luminescent spectrum of nano composite (nco) TiO2/SnO2 films were measured to determine width of forbidden band. Results showed absorption and luminescent spectrum of them all have red moving to visible light region, these showed that there is narrowing forbidden band of nco TiO2/SnO2 films compared with nano TiO2 films prepared by the same method. The electric properties of the films as surface's resistivity, carrier density, sensitivity of carriers based on Hall Effect were also carried out to explain for role of component phases within changing photo-electric properties of nano TiO2 films.