Abstract
Nanostructures of cadmium oxide (CdO) thin films were deposited by sol-gel dip coating technique on glass and Si substrates. X-ray diffraction patterns and selected area electron diffraction patterns confirmed the nanocrystalline cubic CdO phase formation. Transmission Electron Micrograph (TEM) of the film revealed the manifestation of nano CdO phase with average particle size lies in the range 1.6 nm to 9.3 nm. From the measurements of transmittance spectra of the films the direct allowed bandgap values have been calculated and they lie in the range 2.85 eV to 3.69 eV with high transparency (~ 75% in the wavelength range 500 - 800 nm) of the film. Particle size have also been calculated from the shift of bandgap from that of bulk value for those films for which the particles are compearable to Bohr exitonic radius.
Highlights
Nanocrystalline semiconductors have attracted much attention due to their novel properties and varaities of promising potentials in extensive applications [1, 2]
The nanostructured of the films, prepared by dispersing the nanoparticles on carbon coated copper grid, were studied at room temperature by using transmission electron microscope (TEM) which revealed the particle size lies in therange 1.6 nm to 9.3 nm
The micrographs and corresponding diffraction pattern of cadmium oxide (CdO) thin films for different annealing temperature have been shown in figure 1 (a) 200°C, (b) 300°C and (c), SEAD for temperature 250°C
Summary
Nanocrystalline semiconductors have attracted much attention due to their novel properties and varaities of promising potentials in extensive applications [1, 2]. Numerous technical advancements in the field of nanostructured materials have stimulated the wide range of research interest in recent years because of various new properties exhibited by them. The nanostructure transparent conducting oxides have gained trememdous importance due to their size dependent optical properties and possible applications in near future. Various research groups around the world are working on the synthesis of several II-VI n-type transparent semiconducing oxide thin films in different process [8,9,10,11,12,13,14,15,16,17,18]. F doped CdO thin film have been reported by us [15] via sol-gel process. The temperature dependent of nanostructural and optical properties of cadmium oxide thin films has been studied
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