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首页> 外文期刊>Physica status solidi, B. Basic research >Morphological and optical studies of self-forming ZnO nanocolumn and nanocone arrays grown by PLD on various substrates
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Morphological and optical studies of self-forming ZnO nanocolumn and nanocone arrays grown by PLD on various substrates

机译：PLD在各种基板上生长的自形成ZnO纳米柱和纳米锥阵列的形貌和光学研究

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摘要

ZnO nanostructures were grown by pulsed laser deposition on c-sapphire, Si (111) (n-type and p-type) and analysed using morphological and optical techniques. Under optimized growth conditions, self-forming arrays of vertically aligned nanostructures were obtained. Scanning electron microscopy studies revealed two main structures: nanocolumns and a ‘moth-eye type’ array of nanocones, which gave a graded effective refractive index. X-ray diffraction measurements indicate that both types of structures are highly oriented along the c-axis. The optical properties were investigated using low temperature photoluminescence (PL) and room temperature (RT) reflection measurements. Low temperature PL spectra for nanocolumns grown on sapphire and n-type Si showed an emission which is similar to that observed for bulk ZnO with a spectrum dominated by donor bound exciton recombination at 3.36 eV and a structured green band. The PL intensity was particularly enhanced for nanocone structures grown on cubic Si substrates. For these samples, additional features, which are not observed for bulk ZnO were observed at 3.12, 3.02 and 2.92 eV following a vibronic progression of 100 meV. RT angular-dependent specular reflection measurements indicated that all the nanostructures act as highly effective broadband antireflection coatings.
机译：ZnO纳米结构通过脉冲激光沉积在c蓝宝石，Si（111）（n型和p型）上生长，并使用形态学和光学技术进行分析。在优化的生长条件下，获得了垂直排列的纳米结构的自形成阵列。扫描电子显微镜研究揭示了两个主要结构：纳米柱和纳米锥的“蛾眼型”阵列，可提供渐变的有效折射率。 X射线衍射测量表明，两种类型的结构均沿c轴高度定向。使用低温光致发光（PL）和室温（RT）反射测量研究了光学性质。在蓝宝石和n型Si上生长的纳米柱的低温PL光谱显示出的发射类似于在块状ZnO上观察到的发射，其光谱主要受施主结合的激子在3.36 eV处复合并形成绿色带。对于在立方硅衬底上生长的纳米锥结构，PL强度特别提高。对于这些样品，在100 meV的电子振动过程中，在3.12、3.02和2.92 eV处观察到了大量ZnO所没有观察到的其他特征。 RT依赖于角度的镜面反射测量结果表明，所有纳米结构都可以用作高效的宽带抗反射涂层。

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