Probing and Manipulating the Luminescence Properties of Porous Semiconductor Nanoparticles

探测和操纵多孔半导体纳米颗粒的发光特性

• 批准号: 0316231
• 负责人: Steven Buratto
• 金额: --
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-15 至 2008-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0316231&HistoricalAwards=false
• 关键词: Probing; Manipulating; Luminescence; Properties; Porous

Steven Buratto of the University of California at Santa Barbara is supported by the Experimental Physical Chemistry Program for research that aims to probe and manipulate luminescence properties of porous silicon nanoparticles. To avoid deleterious averaging effects, optical properties will be probed on isolated nanoparticles derived from bulk porous silicon, using single molecule spectroscopic techniques. Project goals include obtaining a detailed understanding of the luminescence properties of these nanoparticles and how such properties depend on the surface functionality, the size of the emitting silicon quantum dot (i.e. porosity of the bulk porous silicon) and the dopant concentration of the silicon starting material. Another goal is to correlate more accurately the size of the emitting species with the luminescence wavelength, in order to determine the degree of quantum confinement. Finally, experiments will determine if the single nanoparticles under study consist of a single two-level system by measuring antibunching in the sample emission. Outcomes are expected to enable new understandings of nanoparticle luminescence properties, aid in the development of porous silicon as an optical material, and suggest new directions to maximize the optical properties of porous silicon. The observation of visible light emission from porous silicon has stimulated tremendous interest over the past several years due to its applications in optoelectronic devices and lasers, and the potential for integration with current silicon processing technologies. Luminescence from porous silicon was first observed over a decade ago, and since that time scientists have struggled to develop a mechanism to describe the photophysical properties of this material. Although a consistent physical description is still lacking, a host of test devices has been produced making use of the tunable luminescence and high surface area of porous silicon. These devices include molecular sensors, light emitting diodes, optical switches, and photovoltaic cells. Successful outcomes for this research are expected to impact the development of further useful devices using porous silicon.

加州大学圣巴巴拉分校的Steven Buratto得到了实验物理化学计划的支持，他的研究旨在探测和操纵多孔硅纳米颗粒的发光特性。为了避免有害的平均效应，我们将利用单分子光谱技术来探测从多孔硅中分离出来的纳米颗粒的光学性质。项目目标包括详细了解这些纳米颗粒的发光特性，以及这些特性如何取决于表面功能、发射硅量子点的大小（即大块多孔硅的孔隙率）和硅起始材料的掺杂剂浓度。另一个目标是更准确地将发光物质的大小与发光波长联系起来，以确定量子限制的程度。最后，实验将通过测量样品发射中的反束来确定所研究的单个纳米颗粒是否由单个双能级系统组成。研究结果有望使人们对纳米粒子的发光特性有新的认识，有助于多孔硅作为光学材料的发展，并为最大化多孔硅的光学特性提供新的方向。由于多孔硅在光电子器件和激光器中的应用，以及与当前硅加工技术集成的潜力，在过去几年中，对多孔硅可见光发射的观察引起了极大的兴趣。人们在十多年前首次观察到多孔硅的发光，从那时起，科学家们就一直在努力开发一种机制来描述这种材料的光物理性质。尽管仍然缺乏一致的物理描述，但利用多孔硅的可调谐发光和高表面积，已经生产了大量的测试设备。这些器件包括分子传感器、发光二极管、光开关和光伏电池。这项研究的成功结果有望影响使用多孔硅的进一步有用设备的发展。