Low Energy Ion Scattering and Scanning Tunneling Microscope Studies of the Nucleation and Growth of Islands on Surfaces

将研究半导体表面（Si）上金属和类金属岛（Ni, Ag, In, Sn， Sb和Te）的成核和生长现象。低能离子散射技术将用于测量材料沉积过程中表面岛屿的覆盖范围，以获得动力学信息。扫描隧道显微镜（STM）将提供空间信息，如岛屿的形状、大小和密度，这可能与系统的热力学性质有关。实验数据将与计算机模拟进行比较，以确定生长机制和物理参数，特别是不同吸附剂的表面扩散常数和线张力。选择了具有广泛性能和行为的材料。STM还将提供关于岛屿电子属性的大小依赖性和支持集群的独特属性的信息。本研究的最终目标是了解成核和生长的动力学和热力学过程，以便通过控制沉积参数（如通量、通量和衬底温度）来指导点、线和/或平面的优化结构的形成。所选择的材料具有广泛的性能和行为。飞行时间低能离子散射技术将提供材料沉积过程中表面岛屿覆盖范围的信息，从而获得动力学信息。扫描隧道显微镜（STM）将用于研究空间信息，如岛屿的形状、大小和密度，这些信息可能与系统的热力学性质有关。实验数据将与计算机模拟数据进行比较，以确定生长机制和物理参数，特别是不同吸附剂的表面扩散常数和线张力。STM还将提供关于岛屿电子性质的尺寸依赖性和支持簇的独特性质的信息。＊＊＊

9521392 Williams The phenomena of nucleation and growth of metals and metalloid islands (Ni, Ag, In, Sn, Sb, and Te), on semiconductor surfaces (Si) will be investigated. Techniques of Time-of Flight Low Energy Ion Scattering will be used to measure the coverage of the surface islands during material deposition to obtain kinetic information. Scanning Tunneling Microscopy (STM) will provide spatial information such as shape, size and densities of the islands, which can be related to thermodynamic properties of the system. The experimental data will be compared with computer simulations to determine growth mechanisms and physical parameters, especially surface diffusion constants and line tensions for different adsorbates. Materials with a broad range of properties and behaviors have been selected. STM will also provide information on the size dependence of the electronic property of the islands and the unique properties of supported clusters. %%% The ultimate objective in this research is to understand the kinetic and thermodynamic processes of nucleation and growth so that the formation of an optimized structure of dots, lines, and/or planes can be guided through control of deposition parameters such as flux, fluence and substrate temperature. The selected Materials have a broad range of properties and behaviors. Techniques of Time-of Flight Low Energy Ion Scattering will provide information on the coverage of the surface islands during material deposition to obtain kinetic information. Scanning Tunneling Microscopy (STM) will be used to study spatial information such as shape, size and densities of the islands, which can be related to thermodynamic properties of the system. The experimental data will be compared with computer simulations data to determine growth mechanisms and physical parameters, especially surface diffusion constants and line tensions for different adsorbates STM will also p rovide information on the size dependence of the electronic property of the islands and the unique properties of supported clusters. ***