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相结合，创造新型电子/光子材料，并寻求更好地了解内部和表面成分以及封端配体在影响量子线光致发光（PL）寿命中所起的化学作用、量子产率和强度间歇性。待探索的材料包括 CdSe、CdTe、InP 和 InAs。研究方法包括：确定最近沿整个量子阱（QW）观察到的PL强度波动的起源和机制；测量单个量子阱内的激子寿命和弛豫过程，作为材料均匀性和表面成分的函数；通过记录光谱和 PL 寿命数据作为温度的函数，表征沿单个 QW 的势能和陷阱位点能量的变化；并沿着单个量子线的长轴探测激子扩散。 非技术性。该项目解决具有技术相关性的电子/光子材料科学主题领域的基础研究问题。这项研究有可能对新型电子设备和传感器的开发产生重大影响。参与该研究项目将成为研究生教育的主要基础，对本科生也具有重要作用。 PI 将继续将来自弱势背景的学生引入他的团队，以加强他们的科学教育。他积极参与三个项目（包括少数族裔外展研究项目的联合创始人），这些项目致力于让年轻人接触科学和独立研究的奇迹。人们发现，课程学习和研究的结合对学生在科学领域的保留有非常重大的影响，这种方法将继续得到强调。