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Etude des réponses optiques de nanocristaux à base de semiconducteurs II-VI : znTe, ZnS et de Zns : mn

Abstract : In this work, we report on the study of the optical responses of nanocrystals semiconductor based II-VI. Here we have determined the optical properties of nanostructured ZnTe, ZnS and 'ZnS:Mn' by spectroscopic ellipsometry (SE). We have obtained the dielectric function and optical transitions of NC-ZnTe by spectroscopic ellipsometry in the spectral range 0.6 à 6.5 eV. The influence of the NC size on the optical properties and on the optical transitions was also shown. The optical responses were extracted using two models: the generalized critical points model of Adachi and the Tauc-Lorentz dispersion formula. Throughout this work we have tried to contribute to the understanding of absorption processes in semiconductor NC with a nondestructive technique by tacking into account the phenomena related to quantum confinement. Despite the indirect nature of ellipsometry requiring a good knowledge of the sample, we demonstrated that it is able to determine several properties of NC (complex refractive index, absorption coefficient, energy gap, optical transition energies, NC of excess, thick layers of silica) and even to take account into defects due to implantation.
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Filsane Filsan Ahmed Youssouf. Etude des réponses optiques de nanocristaux à base de semiconducteurs II-VI : znTe, ZnS et de Zns : mn. Autre [cond-mat.other]. Université Paul Verlaine - Metz, 2011. Français. ⟨NNT : 2011METZ009S⟩. ⟨tel-01748905⟩



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