Optical study of zinc blend SnS and cubic In2S3:Al thin films prepared by chemical bath deposition
Abstract
Multilayers of zinc blend SnS crystalline thin film have been deposited onto glass substrates by a chemical bath deposition (CBD) method. The envelope method, based on the optical transmission spectrum taken at normal incidence, has been successfully applied to determine the layer thickness and to characterize optical properties of thin films having low surface roughness. Optical constants such as refractive index n, extinction coefficient k, as well as the real (εr) and imaginary (εi) parts of the dielectric constant were determined from transmittance spectrum using this method. Obtained low value of the extinction coefficient in the transparency domain is a good indication of film surface smoothness and homogeneity. To perform the heterojunction structure based on SnS absorber material, cubic In2S3:Al was deposited on SnO2:F/glass as window layer using CBD with different aluminum content. Optical properties of these films were evaluated.
Keywords
SnO2 Chemical Bath Deposition Window Layer Envelope Method Good Optical QualityNotes
Acknowledgements
The authors wish to thank the Comité Mixte de Cooperation Universitaire for financial support under the project number 07S/1304, as well as Egide France under the Project Hubert Curien Utique number 07S/1304. We are also grateful to Pr. M. Amlouk, Unité de physique des Dispositifs à Semiconducteurs (UPDS) of Faculty of Sciences of Tunis, Tunisia, for help.
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