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首页> 外文学位 >Routes to control the crystal structure, morphology and aligned growth of quasi-one-dimensional zinc-cadmium-selenium nanostructures by metalorganic chemical vapor deposition.
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Routes to control the crystal structure, morphology and aligned growth of quasi-one-dimensional zinc-cadmium-selenium nanostructures by metalorganic chemical vapor deposition.

机译：通过金属有机化学气相沉积来控制准一维锌-镉-硒纳米结构的晶体结构，形态和取向生长的途径。

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摘要

Studying quasi-one-dimensional (1D) semiconductor nanostructures is an attractive and active research field in nanoscience and nanotechnology. Their controllable growth is the foundation for observing novel properties and fabricating useful nano-devices and is also a challenge.;We have studied the control of the structure, morphology and alignment of Zn-Cd-Se 1D nanostructures by fine tuning their growth conditions and judiciously choosing substrates in a metalorganic chemical vapor deposition (MOCVD) reactor. We found that the products are zincblende structured nanoneedles at relatively low temperatures and pressures, and wurtzite structured nanowires at high temperatures and pressures. We have fabricated aligned 1D nanostructures of different chemical compositions by exploiting the epitaxial relationship between the lattices of Zn-Cd-Se system and GaAs substrate. From the systematic studies of the orientations of the aligned samples, we demonstrated that they can be controlled by the crystallographic surface of the substrate. We also found that the orientation can be affected by the growth temperature. Three growth models are suggested to explain the aligned growth for zincblende and wurtzite 1D nanostructures and complex shaped three-bladed nanoswords. Observations and angular measurements of the orientations and growth directions by electron microscopy and analyses by pole stereographs offer supporting evidences for the models. Polarized photoluminescence studies of individual CdSe nanowires obtained under controlled growth have been achieved.;We believe that our work in perfecting the fabrication of aligned 1D semiconductor nanostructures and control of their morphology, crystal structure and orientation will shed more light on the understanding on 1D physics and advancement in nanotechnology.
机译：研究准一维（1D）半导体纳米结构是纳米科学和纳米技术中一个有吸引力且活跃的研究领域。它们的可控生长是观察新特性和制造有用的纳米器件的基础，也是一个挑战。在金属有机化学气相沉积（MOCVD）反应器中明智地选择基材。我们发现产品是在相对较低的温度和压力下为闪锌矿结构的纳米针，在高温和压力下为纤锌矿结构的纳米线。我们通过利用Zn-Cd-Se系统的晶格与GaAs衬底之间的外延关系，制造了具有不同化学成分的对齐一维纳米结构。通过对对准样品取向的系统研究，我们证明了它们可以通过基质的晶体学表面来控制。我们还发现，取向会受到生长温度的影响。建议使用三种生长模型来解释闪锌矿和纤锌矿一维纳米结构以及复杂形状的三刃纳米剑的排列生长。通过电子显微镜观察和对取向和生长方向进行角度测量，并通过极坐标立体图进行分析，为该模型提供了支持性证据。我们已经完成了在受控生长下获得的单个CdSe纳米线的偏振光致发光研究。;我们相信，我们在完善对准的一维半导体纳米结构的制造以及其形态，晶体结构和取向控制方面的工作将为一维物理学的理解提供更多的启发和纳米技术的进步。

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  • 作者

    Liu, Zhuang.;

  • 作者单位

    The Chinese University of Hong Kong (Hong Kong).;

  • 授予单位 The Chinese University of Hong Kong (Hong Kong).;
  • 学科 Physics Condensed Matter.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 89 p.
  • 总页数 89
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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