Abstract
This study aims to prepare Cadmium Sulphide (CdS) thin films using thermal Chemical Spray Pyrolysis (CSP) on glass of different temperatures substrate from cadmium nitrate solution. Constant thickness was (430 ± 20 nm) and the effect of substrate temperature on the optical properties of prepared thin films.
 Optical properties have been studied from transmittance and absorbance spectral within wavelengths range (360 - 900 nm). The results show that all the prepared films have a direct electron transitions and optical energy gap between (2.31-2.44 eV). They also show that the transmittance and optical energy gap of films prepared from nitrate solution increase with increasing of substrate temperature, then transmittance start downward with the continued increase in temperature (400, 450) oC.
Highlights
The study of thin film materials is of interest to researchers as they are the main elements of the continuous technological advances in the fields of electron, optical and magnetic devices [1]
Cadmium supplied thin films are introduced in a chemical degradation manner: 1. The water solution of the cadmium hydrothermal nitrate (Cd (NO3)2.4H2O) was a quick soluble white substance in water of molecular weight (308.47g / mol) and purity (99.999 %) which was a source of cadmium ions (Cd+2) 0.1M) by dissolving a certain weight of cadmium nitrate using a magnetic mixer in a certain volume of distilled water according to the following relationship [6]: M
The results showed that the Transmittance increases with the increase of the wavelength of all thin films and increases with the increase of the temperature of the substrate to (350) ̊C and begins with decreasing and continuing to increase the temperature of the substrate
Summary
The study of thin film materials is of interest to researchers as they are the main elements of the continuous technological advances in the fields of electron, optical and magnetic devices [1]. The importance of semi-conductor materials in the scientific and industrial fields has been emphasized for its unique physical characteristics. It has been used in many applications for example: transistor, integrated circuits, diodes used as emitters, light emitting diodes, solar cells, photovoltaic filters, reagents and magnetic memory devices [4,5]. The optical characteristics of (CdS) thin films prepared at different substrate temperatures, including transmittance and absorption measurements for all thin films within the range of wavelengths (360 – 900) nm and at temperatures of (250, 300, 350, 400, 450) oC and (430 ± 20nm). Reflectivity and many optical constants were calculated by means of the Transmittance and absorptive spectra of these thin films, Optical Energy gap, Extinction Coefficient, refractive index, dielectric constant real and imaginary partially
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
