, les gaps directs du modèle TB sont plus petits -avec l'écart entre deux modèles qui devient plus important vers les grandes déformations -similaire à ce qui est observé sur Ge. Le modèle TB donne un seuil de déformation supérieur pour passer au gap direct, mais cela peut être expliqué par l
6 -La variation de gap, des niveaux de conduction, de valence et de taux d'occupation des orbitales calculés avec le modèle TB sous une déformation biaxiale ,
7 -La variation du gap, des niveaux de conduction, de valence et le taux d'occupation des orbitales calculés avec le modèle TB sous une déformation uniaxiale, vol.100 ,
, De plus, le GeSn présente aussi des potentiels pour les transistors à haute mobilité, grâce à une faible masse effective de la vallée ?
1 : Comparaison des structures de bande de Ge0.5Sn0.5 en liaison forte (rouge) et ab ,
2 : Comparaison des structures de bande de Sn en liaison forte (rouge) et ab-initio + GW0 (bleu) Bibliographie ,
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,
, Le même dispositif est ensuite utilisé pour caractériser l'effet laser dans plusieurs types de micro-cavités GeSn, révélant une dépendance de la température maximale et du seuil laser respectivement à la concentration de Sn et à la qualité cristalline du matériau. Ces deux hypothèses sont ensuite confirmées avec les modélisations du gain optique et des équations laser. Les résultats de simulation suggèrent que limiter l'effet de l'absorption intervalence et augmenter le temps de vie non-radiatif sont des pistes les plus efficaces pour améliorer les performances du laser GeSn. Ces remarques dirigent l'attention vers les couches GeSn déformées en uniaxe [100] et en biaxe (100), Ce travail de thèse est dédié à l'étude de l'effet laser dans les couches GeSn entre 13% et 16% de Sn
, Mots clés : GeSn, Laser, FTIR, Méthode de pseudopotentiel empirique, Absorption intervalence, Gain optique, Recombinaison non-radiatives