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F. Mammeri, Université Paris VI, 2003. Caractérisation par perméation au flux gazeux : hélium Pour commencer cette étude, nous choisissons l'hélium comme perméant, Cette mesure, rapide et reproductible permet une bonne évaluation des structures

, est caractéristique d'une dégradation par infiltration au travers des défauts de la couche ALD. Les essais sur substrat OLED se recoupent avec notre étude en perméation au gaz : le revêtement CP2 permet effectivement de diminuer la vitesse d'apparition

, Cette couche est pourtant usuellement utilisée en microélectronique et est celle utilisé dans la structure multicouche SHB. Nous n'expliquons pas distinctement l'accélération des dégradations, il est possible que la résine organique se gorge d'eau et accélère ainsi l'étape d'adsorption de l'humidité sur la couche ALD, voire provoque le décollement de cette dernière. Nous avons précédemment observé une différence de comportement à l'humidité ambiante lors des mesures de perméation hélium, Curieusement, l'encapsulation par une simple couche organique (R1) provoque, dans 29 % des cas de fortes défaillances sur les systèmes OLED, et un important développement de points noirs dans 71 % des cas

, ? Utilisation en couche d'interface

O. Sur-système, SHB) et (T2, COMETS) est faible. À l'incertitude près, le nombre de puces présentant des défauts de vieillissement est similaire pour les deux architectures (Figure IV-25-b, Tableau IV-15). La différence est bien moins marquée que dans le cas de la mesure de BIF HeTR (Figure IV-21). Ce résultat est attribué à la différence de sollicitation mécanique des échantillons, vol.1

, second dépôt ALD est notable avec une augmentation de 91 % du pourcentage de puces sans défauts pour la structure SHB en comparaison de l'encapsulation bicouche correspondante. Ce résultat signifie que, bien que le second dépôt ALD apparaisse imparfait et granuleux (Figure IV-23), ses propriétés barrières ne sont pas négligeables. Aucune dégradation majeure n'est observable dans cette étude ; nous supposons que, contrairement au système bicouche, la couche organique (R1) est ici suffisamment isolée et ne crée pas de perturbations en se dégradant face à l'humidité

L. , un nouveau dépôt haute barrière par ALD est positif ; il n'est cependant pas suffisant pour protéger l'ensemble des puces, ce qui est attribué à la dégradation non négligeable de l'ALD de surface face à l'humidité

, En conditions climatiques sur substrat OLED, les architectures d'encapsulation COMETS et SHB sont globalement équivalentes. Ce résultat recoupe également nos observations en perméation hélium, pour lesquelles, un BIF similaire lié à l'ajout de la douche ALD ou de la dyade ALD-CP2 avait été observé. ? Architecture multicouche complète

, La finalisation de la structure par un revêtement CP2 en surface permet, comme prévu, d'améliorer la résistance du système en vieillissement climatique (Figure IV-25, Tableau IV-15). Bien que les structures (T1, SHB) et (T2, COMETS) soient initialement assez performantes avec plus de 90 % de puces intactes après 500 heures de stockage, ce nombre est encore amélioré de quelques pourcents avec la structure Cocoon

, Jusqu'à présent nous avons testé la résistance des dispositifs face à la vapeur d'eau or, lors de la vie commerciale, il est possible que les dispositifs soient soumis à de la condensation, donc à de l'eau liquide. Un sondage a également été effectué en déposant une goutte d'eau déionisée sur certaines puces, Comme nous l'avons précédemment étudié, l'ajout de la couche CP2 en surface permet d'isoler les couches barrières ALD et ainsi de limiter les dégradations liées à l'environnement humide

, D'après notre étude, le composite CP2 sélectionné pour notre application, s'est avéré est parfaitement compatible avec l'application sur substrat OLED. REFERENCES BIBLIOGRAPHIQUES

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, Dans cette gamme de longueur d'onde, l'énergie n'est pas suffisante pour provoquer la transition électronique d'une liaison mais peut provoquer le mouvement de groupes d'atomes. En effet, sur certaines longueurs d'onde caractéristiques les liaisons entrent en résonnance, s'étirant ou oscillant ; l'énergie est absorbée. En pratique l'absorption est exprimée en fonction de la longueur d, La spectroscopie InfraRouge à Transformée de Fourier (FTIR) permet d'obtenir les caractéristiques d'absorption dans la gamme infrarouge d'un échantillon solide

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H. Scissoring,

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, et 1636 cm -1 . Les deux dernières sont attribuées à l'étirement de la liaison carbone-carbone (C=C) porté par les silanes et par les monomères acrylates. De la même manière, dans cette étude, Dans la gamme 1500-1650 cm -1 , trois contributions sont observées à 1602, 1919.

, Figure A-4 : Correction de la ligne de base et déconvolution des bandes d'absorption FTIR dans la gamme 1550-1800 cm -1 pour le vernis : (a) en forme liquide et (b) en film condensé sous UV

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