Intraband Spectroscopy and Dynamics in Semiconductor Nanocrystals Colloids

半导体纳米晶体胶体的带内光谱和动力学

• 批准号: 0108101
• 负责人: Philippe Guyot-Sionnest
• 金额: $ 31.5万
• 依托单位: University of Chicago
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-01 至 2004-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0108101&HistoricalAwards=false
• 关键词: Intraband; Spectroscopy; Dynamics; Semiconductor; Nanocrystals

Electrons injected in the conduction band of a quantum dot exhibit strong intraband transitions in the mid-infrared and this is interesting for potential applications. This individual investigator award provides support for a project to discern and control the mechanisms that influence the energy, coherence and lifetime of the intraband transitions, in particular the role of phonons and surface states, issues that are currently unclear. The project deals with colloid quantum dots prepared by solution chemistry that allow for the modification of the surfaces. This should provide an important element of control in the electron dynamics. The characterization of the spectroscopy and dynamics of the electrons involves steady state and picosecond time-resolved optical studies using lamp and infrared laser spectrometers. This project, combining wet organometallic chemistry along with extensive charaterization of the nanostructures, offers an excellent opportunity for training graduate students in a frontier area of optical material science. %%%Electrons inside a nanoscopic semiconductor particle are very sensitive to infared radiation and this is interesting for potential applications in the mid-infrared, from lasers to detectors, and night-vision. This individual investigator award provides support for a project to discover and control the mechanisms that influence the infrared response of the electrons. This will be necessary in order to take advantage of the flexibility with which the optical response of the electron can be "engineered" via the size, shape and composition of the nanostructure. Chemistry is used to make the semiconductor particles in solutions. These solutions readily exhibit the effects of quantum mechanics via their strong colors, and they can be processed to make more practical gels or thin films with identical properties. This project combines chemistry and optics of nanomaterials and it offers an excellent opportunity for training graduate students in this technologically promising area of material science.***

在量子点的传导带中注入的电子在中红外波段表现出强烈的带内跃迁，这对于潜在的应用是有趣的。这项个人研究者奖为一个项目提供了支持，该项目旨在识别和控制影响能带内跃迁的能量、相干性和寿命的机制，特别是声子和表面态的作用，这些问题目前尚不清楚。该项目涉及通过溶液化学制备的胶体量子点，允许对表面进行修饰。这将在电子动力学中提供一个重要的控制元素。电子的光谱学和动力学表征涉及使用灯和红外激光光谱仪进行稳态和皮秒时间分辨光学研究。该项目结合了湿有机金属化学和纳米结构的广泛表征，为培养光学材料科学前沿领域的研究生提供了极好的机会。纳米级半导体粒子内部的电子对红外辐射非常敏感，这对于中红外的潜在应用非常有趣，从激光到探测器，以及夜视。该个人研究者奖为发现和控制影响电子红外响应的机制的项目提供支持。为了利用电子的光学响应可以通过纳米结构的大小、形状和组成“工程化”的灵活性，这将是必要的。化学是用来在溶液中制造半导体粒子的。这些溶液通过其强烈的颜色很容易表现出量子力学的效应，它们可以被加工成更实用的凝胶或具有相同性能的薄膜。该项目结合了纳米材料的化学和光学，为培养材料科学这一技术前景广阔的领域的研究生提供了极好的机会