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

技术上的。该项目利用合成专业技术与独特的光学光谱测量相结合，以创造新型电子/光子材料，并寻求更好地了解内部和表面组成以及封顶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所起的化学作用。待探索的材料包括镉、镉、铟和铟。该研究方法包括：确定最近观察到的沿整个量子阱(QW)的光致发光强度波动的来源和机制；测量单个QW内的激子寿命和弛豫过程作为材料均匀性和表面组成的函数；通过记录光谱和光致发光寿命数据来表征沿单个QW的势能和陷阱位置的能量随温度的变化；以及探测沿着单个QW长轴的激子扩散。非技术性。该项目涉及具有技术相关性的电子/光子材料科学专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。参与这一研究计划将是研究生教育的主要基础，对本科生具有重要作用。国际学生联合会将继续吸收来自代表性不足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)，这些项目努力让年轻人接触到科学和独立研究的奇迹。课程学习和研究的结合已被发现对留住学生的科学有非常重要的影响，这一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.