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

技术。该项目利用并结合了合成专业知识和独特的光学光谱测量，创造了新的电子/光子材料，并寻求对内部和表面成分以及盖层配体在影响量子线光致发光（PL）寿命、量子产率和强度间歇性方面的化学作用的更深入理解。探索的材料包括CdSe、CdTe、InP和InAs。研究方法包括：确定最近在整个量子阱（QWs）上观测到的PL强度波动的起源和机制；测量单个量子阱中随材料均匀性和表面组成变化的激子寿命和弛豫过程；通过记录光谱和PL寿命数据作为温度的函数来表征单个量子阱的势能和阱位的能量变化；探测激子沿单量子阱长轴的扩散。非技术。本项目旨在解决电子/光子材料科学中具有技术相关性的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发展产生重大影响。参与本研究计划将是研究生教育的主要基础，对本科生也有重要作用。PI将继续吸收来自弱势背景的学生加入他的小组，以加强他们的科学教育。他积极参与了三个项目（包括一个少数民族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到科学和独立研究的奇迹。课程学习和研究的整合已经被发现对学生对科学的保留有非常显著的影响，这种方法将继续得到强调。

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.