Thickness effect on the structural and optical constants of stibnite thin films prepared by sulfidation annealing of antimony films
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- 作者：M. Haj Lakhdar ; B. Ouni ; Bachir.ouni@laposte.net" class="auth_mail ; M. Amlouk
- 关键词：Thin films ; Band gap ; Urbach tailing ; Crystallite size ; Optical constants
- 刊名：Optik - International Journal for Light and Electron Optics
- 出版年：May 2014
- 年：2014
- 卷：125
- 期：10
- 页码：2295-2301
- 全文大小：1513 K
文摘
This paper deals with some physical properties of antimony sulphide Sb2S3 thin films obtained by an annealing process in sulphur vapors at 300 °C of Sb thermal evaporated thin films deposited on glass substrate. The crystal structure and surface morphology were investigated by both XRD and AFM techniques. This structural study shows that Sb2S3 thin films were well crystallized in orthorhombic structure and some parameters such as the lattice parameter, crystallite size, microstrain and degree of preferred orientation have been reported and correlated with the effect of crystallite size. On the other hand, the refractive index and the extinction coefficient were discussed in terms of the Forouhi–Bloomer model. The optical band gap was found to range from 1.75 to 2.23 eV. Finally, the analysis of the optical parameters extracted from the Urbach–Martienssen and Forouhi–Bloomer models lead to some explanations of the correlations between the structural properties in terms of the crystallite size and optical ones.