Abstract
Spray pyrolysis technique (SPT) is employed to synthesize cadmium oxide nanostructure with 3% and 5% Cobalt concentrations. Films are deposited on a glass substrate at 350 ᵒC with 150 nm thickness. The XRD analysis revealed a polycrystalline nature with cubic structure and (111) preferred orientation. Structural parameters represent lattice spacing, crystallite size, lattice parameter and dislocation density. Homogeneous surfaces and regular distribution of atoms were showed by atomic force microscope (AFM) with 1.03 nm average roughness and 1.22 nm root mean square roughness. Optical properties illustrated a high transmittance more than 85% in the range of visible spectrum and decreased with Co concentration increasing. The absorption coefficient values decreased with increasing wavelength and the prepared films had absorption coefficient values greater than 104 cm-1. The optical energy gap values for allowing direct transition (ADT) varied from 2.78 to 2.63 eV with increasing Co concentration, while the energy gap for allowing indirect transition (AIDT) varied from 1.85 to 1.6 eV with Co concentration.
Highlights
TCOs or transparent conducting oxides are compounds that either have a binary or ternary compound. They are unique materials because they show the transparency of light and electrical conductivity at the same time, they are a fundamental pillar in the study of the properties of physical substances as well as their adoption in many applications [1]
TCOs are compound semiconductors made of metal combined with oxygen. This material possesses high optical conductivity within the spectrum region extending from 400 nm to 1500 nm, despite the widening energy gap of these materials, but the conduction band is filled with free electrons due to the high concentration of charge carriers [5,6]
The increase in bandgap could lead to a decrease in electrical conductivity
Summary
TCOs or transparent conducting oxides are compounds that either have a binary or ternary compound They are unique materials because they show the transparency of light and electrical conductivity at the same time, they are a fundamental pillar in the study of the properties of physical substances as well as their adoption in many applications [1]. TCOs are compound semiconductors made of metal combined with oxygen This material possesses high optical conductivity within the spectrum region extending from 400 nm to 1500 nm, despite the widening energy gap of these materials, but the conduction band is filled with free electrons due to the high concentration of charge carriers [5,6]. Several previous studies dealt with the study of transparent conducting oxides and their physical fundamentals in addition to their structural properties [6–8]
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