Structure Formation Processes and Phase Transitions in Metastable Mixed III/V Semiconductors and Heterostructures

亚稳态混合 III/V 半导体和异质结构中的结构形成过程和相变

• 批准号: 5378954
• 负责人: Professorin Dr. Kerstin Volz
• 金额: --
• 依托单位: Wissenschaftliches Zentrum für Materialwissenschaften
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2002
• 资助国家: 德国
• 起止时间: 2001-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5378954?language=en
• 关键词: Structure; Formation; Processes; Phase; Transitions

The present project deals with the fundamental structure formation processes in the bulk and at the heterointerfaces of the metastable material systems under investigation. The aim is to gain a profound understanding of the structure of the materials and of their heterostructures and to exploit the driving forces for the novel morphological phase transitions, which they undergo due to their metastability. The quantitative description of the structure and morphology can be correlated to novel electronic properties. This understanding will also lead to novel optimised device applications. In order to quantitatively examine the quaternary systems, the nanoanalytical techniques used will be developed further to suit the needs of simulating composition, structure and interface morphology of quaternary materials. The experimental methods applied focus on (high resolution) transmission electron microscopy including quantitative image simulation. Further techniques, which are necessary to achieve this goal, include high resolution X-ray diffraction as well as techniques of the nuclear solid state physics (Rutherford Backscattering Spectrometry, Nuclear Resonance Analysis, Channeling) for the investigation of the strain state, elemental composition and defects in the materials.

本项目研究的是亚稳材料体系中本体和异质界面的基本结构形成过程。目的是获得对材料结构及其异质结构的深刻理解，并利用它们由于亚稳态而经历的新型形态相变的驱动力。结构和形态的定量描述可以与新的电子性质相关联。这种理解也将导致新的优化设备应用。为了定量研究四元体系，纳米分析技术将进一步发展，以适应模拟四元材料的组成、结构和界面形貌的需要。实验方法主要应用于（高分辨率）透射电子显微镜，包括定量图像模拟。进一步的技术，这是实现这一目标所必需的，包括高分辨率x射线衍射以及核固体物理技术（卢瑟福后向散射光谱，核共振分析，通道），用于研究材料的应变状态，元素组成和缺陷。