Spectroscopy and Dynamics of Semiconductor Clusters

半导体团簇的光谱学和动力学

基本信息

批准号：
0139064
负责人：
Daniel Neumark
金额：
$ 45万
依托单位：
University of California-Berkeley
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2002
资助国家：
美国
起止时间：
2002-04-15 至 2006-03-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0139064&HistoricalAwards=false
关键词：
Spectroscopy Dynamics Semiconductor Clusters

项目摘要

This project focuses on the spectroscopy and dynamics of size-selected group IV and III-V semiconductor clusters using several experimental techniques based on negative ion photodetachment to characterize how the properties of these species vary with size and stoichiometry. The corresponding bulk compounds play a key role in the semiconductor and electronics industries so these studies are highly relevant to nano-device technologies in that they probe how the properties of the bulk materials evolve from their atomic and molecular constituents. The project will focus on binary III-V nitride compounds, silicon clusters, and indium phosphide clusters. Properties of interest include vibrational frequencies and electronic state splittings in small clusters, the evolution of valence and conduction bands as the cluster size increases, electronic relaxation dynamics in excited states of the clusters, and the fragmentation patterns resulting from photodissociation. In all the experiments, mass-selected beams of semiconductor cluster anions are generated and photodetached. The primary experimental method is fixed-frequency anion photoelectron spectroscopy, which provides a general means to determine the electronic and vibrational structure of a size-selected neutral cluster. This technique will be complemented by tunable laser photodetachment, time-resolved photoelectron spectroscopy, and fast beam photofragment translational spectroscopy experiments.%%%Understanding how physical and chemical properties of matter evolve with size is crucial to many potential applications designed to meet significant societal needs. Emphasis is placed on select elemental clusters, for which the corresponding bulk compounds play a major role in the fabrication of fast devices such as transistors and photodiodes. The proposed studies are important because they provide training for future scientists and engineers in key areas of national interests.

该项目的重点是使用基于负离子光编组的几种实验技术，尺寸选择的IV和III-V半导体簇的光谱和动力学，以表征这些物种的性质如何随尺寸和stoichiimetry而变化。相应的体积化合物在半导体和电子产业中起关键作用，因此这些研究与纳米脱位技术高度相关，因为它们探测了大量材料的特性如何从其原子和分子成分中进化。该项目将重点放在二进制III-V氮化物化合物，硅簇和磷化物簇。感兴趣的特性包括小簇中的振动频率和电子状态分割，随着簇尺寸的增加，价和传导带的演变，簇的激发态中的电子弛豫动力学以及由光电隔离的片段化模式。在所有实验中，都会生成和光检查半导体簇阴离子的质量选择的光束。主要的实验方法是固定频率阴离子光学光谱，该光谱光谱法提供了确定尺寸选择的中性簇的电子和振动结构的一般手段。该技术将通过可调节激光光检查，时间分辨的光电子光谱和快速光束光谱转换光谱实验实验来补充。%% %%了解物质的物理和化学性质与大小的物理和化学特性对于旨在满足重要社会需求的许多潜在申请至关重要。重点放在精选的元素簇上，相应的体积化合物在制造快速设备（例如晶体管和光二极管）中起着重要作用。拟议的研究很重要，因为它们为未来的科学家和工程师提供了国家利益的关键领域的培训。