Abstract
Analysis of the optical and Solid State properties of MgS thin film using theoretical approach of beam propagation technique in which a scalar wave is propagated through the material thin film deposited on a substrate with the assumption that the dielectric medium has homogenous reference dielectric constant term, and a perturbed dielectric term, representing the deposited thin film medium is presented in this work. These two terms, constituted arbitrary complex dielectric function that describes dielectric perturbation imposed by the medium of for the system. This is substituted into a defined scalar wave equation in which the appropriate Green’s Function was defined on it and solved using series solution technique in conjunction with Born approximation method in order to obtain a model equation of wave propagating through the thin film. This was used in computing the propagated field for different input regions of field wavelength such as ultraviolet, visible and infrared region respectively during which the influence of the dielectric constants of the thin film on the propagating field were considered. The results obtained from the computed field were used in turn to compute the band gaps, solid state and optical properties of the thin film such as reflectance, Transmittance and reflectance. The electrical and optical conductance was also computed.
Highlights
It has been discovered that materials known as dilute magnetic semiconductors (DMS) have become a focus of intense research activity as they exhibit an interesting combination of magnetism and semiconductivity
DMS material [1,2] Deposition of Manganese Sulphide (MnS) is based on the slow release of Mn21and S22 ions in a solution which condenses onto the substrate
Based on the recent interest to use theoretical analysis on the study of thin films, the behavior of electromagnetic wave propagation through material thin film in relation to its solid state property had been veraciously studied in term of the influence of dielectric constants and in terms of assessment of beam propagation.[5,6,7]For instant, we have looked at the propagation of electromagnetic field through a conducting surface [8] where the behaviour of wave propagated through such material coupled with the influence of the dielectric function of the medium such on such material was analyzed
Summary
It has been discovered that materials known as dilute magnetic semiconductors (DMS) have become a focus of intense research activity as they exhibit an interesting combination of magnetism and semiconductivity. The following solutions were freshly prepared in distilled water prior to the deposition of MnS films; 1.0 M Mn acetate, 1.0 thioacetamide, and 1.4MNH4Cl. TEA and hydrazinehydrate solutions were used . Anuar and Ho who deposited same thin film using the same technique, but this time using ITO glass substrate reported the energy band gap to be 3.00eV.[3,4 ]. The effect of variation of refractive index of FeS2 had been carried out theoretically for the purpose of getting a clear understanding of the how variation of refractive index of the tin film effects its application in optoelectronic and solar cell [9] From the study, a close look on the concept made it clear to recognize the importance of the effect of the refractive index of the medium in the reality of the two velocity components that normally give rise to phase and group refractive indices as considered study of wave propagation[10,11,12]. The computed the values were in turn used to obtain the band gap and some other solid state and optical properties of the MnS thin film
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