Shifts in the threshold voltage (ΔVth) of transparent zinc tin oxide (ZTO) transistors under gate bias stress are studied. The effect of composition and processing temperature on the device stability has been investigated. Based on the research, highly stable transistors with ΔVth as small as 30mV after 1000min of operation have been fabricated with a composition of [Zn]:[Sn]=36:64. As current drivers in active matrix displays their stability renders ZTO thin film transistors (TFTs) a very attractive alternative to TFTs based on established technologies.
Die Mechanochemie zeichnet sich durch eine enorme Vielfalt potenzieller Einsatzgebiete aus. Die Standard‐Syntheseverfahren der Festkörperchemie erfordern oftmals hohe Temperaturen oder Drücke, definierte Gasatmosphären sowie spezielle Eduktbeschaffenheiten. In der Mechanochemie benötigt man dagegen lediglich eine hinreichend leistungsfähige Kugelmühle mit Zubehör. So können viele chemische Reaktionen auf nichtthermischem, die Umwelt weniger belastenden Weg durchgeführt werden.
At present, the high‐energy milling method becomes widely used for the preparation of nanocrystalline materials due to its relative simplicity and availability. In this research report, selected examples are presented of the preparation of nanoscale spinel ferrites by mechanical activation and mechanosynthesis. Nanosized particles of mechanochemically prepared spinel ferrites are structurally and magnetically disordered due to the non‐equilibrium cation distribution and non‐collinear spin arrangement. As a consequence, they exhibit interesting physical and chemical properties markedly different from those of their bulk counterparts. Several interesting features are involved in the work, e.g., superparamagnetism, an enhanced chemical reactivity, an irreversible magnetic behaviour, an enhanced magnetic ordering temperature, and an altered (reduced or enhanced) saturation magnetization in comparison with the corresponding bulk materials. Taking into account the considerable relevance of the thermal stability of nanoscale complex oxides to nanoscience and nanotechnology, results on the response of mechanochemically prepared spinel ferrites to changes in temperature will also be presented.
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