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Etude et simulation des composés semiconducteurs et leurs alliages pour des applications optoélectroniques

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dc.contributor.author AIMOUCH Djamel Eddine
dc.date.accessioned 2018-11-10T08:52:26Z
dc.date.available 2018-11-10T08:52:26Z
dc.date.issued 2017-04-13
dc.identifier.uri http://hdl.handle.net/123456789/923
dc.description.abstract Our goal in this work is to find new compound semiconductors for optoelectronic applications. We use the method of augmented plane wave (FP-LAPW) based on the density functional theory (DFT) implemented in the WIEN2k code. We use the local density approximation (LDA) to determine the structural, electronic, magnetic and optical properties of our compounds. To better approach to reality and to the experimental results, we used the Hubbard parameter which adds the Coulomb repulsion of the valence electrons. The semiconductor ZnO, ZnS, CdS are widely used in optoelectronic devices such as solar cells, optical sensors, light emitting diodes LEDs etc ....Moreover, we have successfully doped these materials to obtain other optoelectronic properties. For example, the ferromagnetic behaviour was obtained in ZnO after doping with potassium K. The potassium K doped ZnO show the optical properties in good agreement with the experimental one. Furthermore, the manganese compound Mn doped ZnS is also very important for optoelectronic applications, however, we studied the effect of manganese on the inter-band transitions of ZnS. The result shows the gap values in good agreement with experimental, and an appearance of significant absorption peaks for optical applications, which suggests that this compound may be a good candidate for optoelectronic devices. Then we have as well studied the co-doping CdS with both impurities Mn and Cr elements. The result shows a half-metallic behavior with metallic character in the spin-up and an insulating character in the spin down channel. The compound CdS:Mn,Cr can also be a good material for magneto-optics applications. en_US
dc.language.iso fr en_US
dc.title Etude et simulation des composés semiconducteurs et leurs alliages pour des applications optoélectroniques en_US
dc.type Thesis en_US


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