Experimental Interrogation of Exciton Dynamics within One-Dimensional Semiconductor Quantum Materials

一维半导体量子材料内激子动力学的实验研究

• 批准号: 0906966
• 负责人: Richard Loomis
• 金额: $ 35.6万
• 依托单位: Washington University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-07-01 至 2013-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0906966&HistoricalAwards=false
• 关键词: Experimental; Interrogation; Exciton; Dynamics; within

Technical. This project utilizes and combines synthesis expertise with unique optical spectroscopic measurements, to create novel electronic/photonic materials, and to seek greater understanding of the chemical roles that internal and surface compositions as well as capping ligands play in influencing quantum wire photoluminescence (PL) lifetimes, quantum yields, and intensity intermittency. Materials to be explored include CdSe, CdTe, InP, and InAs. The research approach includes: determination of the origin and mechanism of the PL intensity fluctuations recently observed along entire quantum wells (QWs); measurement of exciton lifetimes and relaxation processes within single QWs as a function of material uniformity and surface composition; characterization of variations in the potential energy and the energetics of trap sites along single QWs by recording spectra and PL lifetime data as a function of temperature; and probing exciton diffusion along the long axis of single QWs. Non-Technical. The project addresses fundamental research issues in a topical area of electronic/photonic materials science having technological relevance. There is potential that the research could substantially impact the development of novel electronic devices and sensors. Participation in this research program will be a primary foundation for the education of graduate students with a significant role for undergraduates. The PI will continue to bring students from underrepresented backgrounds into his group to enhance their science education. He is active in three programs (including co-founder of a minority outreach research program) that strive to expose young minds to the wonders of science and independent research. The integration of coursework learning and research has been found to have a very significant impact on the retention of students in science, and this approach will continue to be emphasized.

技术的。该项目利用并将合成专业知识与独特的光学光谱测量结合在一起，创建新型的电子/光子材料，并寻求对内部和表面成分以及封盖配体在影响量子质量光发光（PL）寿命（PL）寿命，量子产量和强度的量度内部的化学作用以及封盖配体在影响的化学作用的了解。要探索的材料包括CDSE，CDTE，INP和INAS。研究方法包括：确定PL强度波动的起源和机制最近在整个量子井（QWS）上观察到；单个QW内的激子寿命和放松过程的测量是物质均匀性和表面组成的函数；通过记录光谱和PL寿命数据作为温度的函数来表征沿单个QW的势能和陷阱位点的能量的表征；并沿单个QW的长轴探测激子扩散。 非技术。该项目解决了具有技术相关性的电子/光子材料科学主题领域的基本研究问题。这项研究可能会大大影响新型电子设备和传感器的发展。参与该研究计划将是研究生教育的主要基础，并在本科生中发挥重要作用。 PI将继续将来自代表性不足的背景的学生带入他的小组，以增强其科学教育。他活跃于三个计划（包括少数派外展研究计划的联合创始人），他们努力将年轻人暴露于科学和独立研究的奇观中。人们发现，课程学习和研究的整合对学生在科学领域的保留有很大的影响，这种方法将继续强调。