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, Les particules étant à l'interface entre deux milieux, deux pics sont donc attendus (i=silice ou i=air). Les données expérimentales nous permettent d'observer le pic relatif au substrat uniquement

, Augmenter l'absorption, grâce à des particules à l'interface de la phase active, précisément dans la gamme visée permettrait d'augmenter l'efficacité globale de la cellule. Pour d'autres applications industrielles (notamment les vitrages bas-émissifs), créer de l'absorption dans le proche infrarouge est un enjeu important. Cependant, la présence d'absorption dans la gamme visible dans nos systèmes peut être un obstacle. Toutefois, nous avons montré que cette absorption dépend de la nature du matériau employé, En termes d'applications, le contrôle des propriétés optiques des réseaux de particules offre de nouvelles perspectives

, Changer le matériau qui compose le substrat permet également de modifier la position du mode du substrat. Le principal défi est lié à l'utilisation du démouillage, qui ne permet pas l'obtention de n'importe quel réseau. Dans l'exemple des réseaux anisotropes, les deux périodes ne peuvent pas être trop différentes : nous avons vu que l'optimisation de l'épaisseur initiale de la couche métallique était dépendante de la texture. Si les deux périodes s'écartent trop, il ne sera plus possible d'avoir une épaisseur correspondant aux deux, D'autres pistes d'expérimentation sont envisageables : une texture anisotrope (un paramètre de réseau différent selon la direction du plan) devrait donner lieu à deux pics d'absorption différents selon notre modèle

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G. Box, Sur une surface plane, si l'on étudie l'absorption, seul un pic à 420 nm est visible. Sur une surface texturée, un deuxième pic émerge. La finesse de ce pic est dépendante de la qualité du réseau de particules, et sa position dépend de la période du réseau avec une relation linéaire. Des simulation optiques ont consolidé notre étude expérimentale. Elles retrouvent les mêmes comportements, et indiquent la présence d'un troisième pic, lui aussi dépendant linéairement de la période du réseau. Ces simulations et ces observations nous permettent d'avancer que les pics d'absorption observés sont dûs au couplage de la lumière, via la diffraction, aux particules. Ce système est prometteur en termes d'applications : il permet de positionner très précisément un pic d'absorption. Par exemple, en le plaçant dans l'IR, ceci permettrait de renforcer une propriétés de basse-émissivité d'un système, Conclusion déterminant dans le contrôle du démouillage. Il existe une densité surfacique optimale de grain en croissance qui la densité surfacique de trous dans la texture, 1979.

, Ceci nous a permis de proposer une nouvelle description du démouillage. La connaissance du phénomène est précieuse en vue de l'amélioration des propriétés optiques des réseaux de particules obtenus par démouillage. Nous avons montré par simulations que le pic d'absorption généré par le réseau est indépendant du matériau qui constitue les particules. Ainsi, la recherche d'un autre métal à faire démouiller permettrait, tout en gardant le pic du réseau dont la position est contrôlée, de faire disparaître l'absorption dans le domaine visible. La nature du substrat est un paramètre déterminant dans la position des pics, permettant de moduler encore davantage la réponse optique du système. Enfin, la texturation par des réseaux anisotropes (possédant deux périodes distinctes suivant la direction du réseau) est une possibilité de faire varier la réponse optique, par exemple en augmentant le nombre de pics d'absorption. Nous disposons d'un bon panorama des paramètres à prendre en compte en vue d'applications industrielles, La configuration de cette thèse était originale, puisqu'elle abordait la question du démouillage sous un angle industriel. Cette approche imposait un système d'étude loin des cas modèles (une couche d'argent polycristalline sur une substrat amorphe)

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