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A comprehensive study of structural and optical properties of ZnO bulk crystals and polycrystalline films grown by sol-gel method
Applied Physics A ( IF 2.7 ) Pub Date : 2020-06-25 , DOI: 10.1007/s00339-020-03711-2
Ewelina Nowak , Miroslaw Szybowicz , Alicja Stachowiak , Wojciech Koczorowski , Detlev Schulz , Kazimierz Paprocki , Kazimierz Fabisiak , Szymon Los

The presented article concerns the comparison between two different zinc-oxide structures - bulk crystals and polycrystalline thin films. Bulk crystals were grown by a Bridgman method. For thin-film production, a sol-gel spin-coated method was chosen. A part of thin layers samples was annealed in 600 $$^{o}$$ o C to induce recrystallization. The morphological and structural properties of all samples were investigated using various microscopy techniques, X-ray diffraction, and Raman spectroscopy. Confocal and scanning electron microscopy, as well as XRD, was used to estimate the influence of the recrystallization process on the morphology of the samples. The Raman vibrations in different scattering geometries were determined using polarized Raman spectra. What is more, in the case of the non-annealed sol-gel layer, the localized reorientation of crystallites was observed, using Raman microscopy. The morphology of the samples was compared to their optical properties, which were investigated by exploiting UV-Vis absorption and photoluminescence spectroscopy. Absorption spectroscopy allowed us to estimate the energy bandgap for different types of ZnO layers and to compare the values obtained for the ZnO crystal structure obtained by the Bridgman method. The photoluminescence and Raman spectroscopy were used to determine the possible defects correlated with the growth conditions.

中文翻译:

溶胶-凝胶法生长的 ZnO 块状晶体和多晶薄膜的结构和光学性质的综合研究

所呈现的文章涉及两种不同氧化锌结构之间的比较 - 块状晶体和多晶薄膜。块状晶体通过布里奇曼方法生长。对于薄膜生产,选择了溶胶-凝胶旋涂方法。一部分薄层样品在 600 $$^{o}$$ o C 中退火以诱导再结晶。使用各种显微镜技术、X 射线衍射和拉曼光谱研究了所有样品的形态和结构特性。共聚焦和扫描电子显微镜以及 XRD 用于估计再结晶过程对样品形态的影响。使用偏振拉曼光谱确定不同散射几何结构中的拉曼振动。更重要的是,在未退火的溶胶-凝胶层的情况下,使用拉曼显微镜观察微晶的局部重新定向。将样品的形态与其光学特性进行比较,通过利用紫外-可见吸收和光致发光光谱对其进行研究。吸收光谱使我们能够估计不同类型 ZnO 层的能带隙,并比较通过 Bridgman 方法获得的 ZnO 晶体结构的值。光致发光和拉曼光谱用于确定与生长条件相关的可能缺陷。吸收光谱使我们能够估计不同类型 ZnO 层的能带隙,并比较通过 Bridgman 方法获得的 ZnO 晶体结构的值。光致发光和拉曼光谱用于确定与生长条件相关的可能缺陷。吸收光谱使我们能够估计不同类型 ZnO 层的能带隙,并比较通过 Bridgman 方法获得的 ZnO 晶体结构的值。光致发光和拉曼光谱用于确定与生长条件相关的可能缺陷。
更新日期:2020-06-25
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