أنا  Muhaj Talib Abdullah

TiO2 thin films with different thickness on some substrates of glass by using thermal evaporation method. The result of optical properties illustrated that the best transmitted appeared at thickness (100 nm) and 900 nm wavelengths with a value equal to 78.2%. The observed band gap value of the direct tran­sitions energy 3.69 eV for 150 nm, 2.95 eV for 300 nm and 2.45 eV for 450 nm

One of the important materials for applications in many photoelectric filed [just like solar cell, optoelectronic and other kinds on devices] is cadmium oxide thin films. There are several physical or chemical synthetic methods have been used to prepare transparent CdO films as described by many researchers. The X-ray diffraction study has confirmed the formation of CdO with nano-size scale. For this research CdO/FTO thin film has been prepared by electrolysis. The thin film is investigated by XRD, SEM and AFM surface morphology properties. XRD analysis showed that CdO films are a polycrystalline and exhibit cubic crystal structure with (111, 200, 311 and 222) orientation and the preferred orientation is 111. AFM and SEM were applied to study the morphology and estimate the surface roughness of the films obtained. (RMS) found that film roughness was 21.7 nm. The CdO film are n-type semiconductors and possess a direct optical band gap around 2.4 eV as shown in optical property studies.

In the recent years TiO2 films are extensively studied because of their interesting chemical, optical and electrical properties. In the researcher work, TiO2 thin films have received great attention, because of having excellent photocatalytic and antibacterial properties when exposed to UV light (320 – 400 nm). TiO2 films spectra have maximum transmission at (900 nm) and exhibit high visible transmittance, up to 78 %, for 150 nm, which decreased slightly to 61.4 % for 450 nm. When wavelength decreases the absorptance will increase. The absorption coefficient is increasing with thickness decreasing (the probability of occurrence direct transition). From the light scattering effect for its high surface roughness the formation stage of anatase was appear with increase in grain size and density of layers. The refractive index increases with thickness increasing, and then the enhancement of growth crystalline. It have found a wide range of applications in various fields like photocatalysis, antibacterial and protective coatings, antireflecting coatings, , etc.