Abstract
In this study, optical constants of different thicknesses of stoichiometric composition As40S60 obtained from transmission spectra were investigated. The effect of exposure to oxygen plasma immersion ion implantation (O−-PIII) on the optical constants of the same samples of different thicknesses was also investigated. It is observed that the O−-PIII treatment can effectively improve the transmission spectra of the samples, particularly in medium and transparent regions; therefore the refractive index decreases. In addition, the optical band gap Egopt was determined before and after PIII from the absorption coefficient values using Tauc's procedure, i.e. from the relationship α hν = K(hν - Egopt )2 where K is a constant. The O−-PIII causes an increase in the energy gap of stoichiometric composition As40S60.
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