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Evolution Of Nanostructure, Phase Transition And Band Gap Tailoring Inoxidized Cu Thin Films

机译：氧化铜薄膜的纳米结构，相变和带隙剪裁的演变

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Nanostructured copper oxide films were prepared by the oxidation of copper films deposited on glass substrates by thermal evaporation of metallic copper. X-ray diffraction (XRD) studies revealed that the films oxidized at temperatures below 275 ℃ were of Cu_2O phase while oxidation above 325 ℃ produced pure CuO phase. Oxidation at temperatures between 275 and 325 ℃ produced films of mixed Cu_2O and CuO phases. Surface morphology of the samples using Atomic Force Microscopy revealed that the surface of the CuO phase film was closely packed when compared with that of Cu_2O phase films. Analysis of high resolution Transmission Electron Microscopy images and XRD patterns together showed that the films of Cu_2O and CuO phases have respectively (111) and (100) preferential orientations. It is evident from the Fourier Transform Infrared results that the formation of Cu_2O is privileged for lower oxidation temperatures whereas higher oxidation temperatures support the formation of CuO. The optical band gap of the film samples was determined from optical transmission spectra. The higher value of band gap for the sample composed of pure CuO phase compared to that of bulk CuO crystals indicated quantum confinement effect.
机译：通过金属铜的热蒸发氧化沉积在玻璃基板上的铜膜来制备纳米结构的氧化铜膜。 X射线衍射（XRD）研究表明，在275℃以下氧化的薄膜为Cu_2O相，在325℃以上氧化产生的纯CuO相。在275至325℃的温度下氧化产生了Cu_2O和CuO混合相的膜。使用原子力显微镜的样品的表面形态显示，与Cu_2O相膜相比，CuO相膜的表面紧密堆积。高分辨率透射电子显微镜图像和XRD图谱的分析表明，Cu_2O和CuO相的薄膜分别具有（111）和（100）优先取向。从傅立叶变换红外结果可以明显看出，Cu_2O的形成对于较低的氧化温度具有优势，而较高的氧化温度则支持CuO的形成。由光学透射光谱确定膜样品的光学带隙。与块状CuO晶体相比，由纯CuO相组成的样品的带隙值更高，表明了量子约束效应。

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