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- W2004148493 abstract "Abstract In this study, the effects of postannealing on ZnO and Al 2 O 3 films grown for a thin‐film transistor (TFT) by the atomic layer deposition (ALD) method were examined using transmission electron microscopy (TEM) and energy‐dispersion spectroscopy. Samples were subjected to rapid thermal annealing for 30 s at 610, 615, 620, and 800 °C in a N 2 atmosphere. At these temperatures, the polycrystalline ZnO layer in a TFT channel rapidly degraded to amorphous, and in the Al 2 O 3 layer of a gate oxide layer of the TFT, a ZnAl 2 O 4 spinel structure was formed because of Al and Zn diffusion. This spinel structure was observed to be independently nucleated, and there were no specific postgrowth crystallographic orientation relations. Additionally, in electrical properties of ZnO‐TFTs with ZnO/Al 2 O 3 layers, typical TFT characteristics was shown until the annealing temperature increased to 600 °C, and the V th gradually decreased from 4.2, 3 to 1.8 V. However, in the 700 °C annealed case, the TFT devices are always opened, and the ZnAl 2 O 4 generation and the ZnO layer degradation was related to the drastic changes of these ZnO‐TFTs characteristics. During postannealing, rapid degradation of the ZnO channel layer and phase transformation by means of diffusion should be carefully considered." @default.
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- W2004148493 date "2010-06-07" @default.
- W2004148493 modified "2023-10-09" @default.
- W2004148493 title "Role of postannealing temperature on the microstructure of Al<sub>2</sub> O<sub>3</sub> /ZnO thin films grown by atomic layer deposition for TFT applications" @default.
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- W2004148493 doi "https://doi.org/10.1002/pssa.201026065" @default.
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