Intraband Spectroscopy and Dynamics in Semiconductor Nanocrystals Colloids

注入到量子点导带中的电子在中红外波段表现出很强的带内跃迁，这对于潜在的应用是很有意义的。这一个人研究人员奖为一个项目提供了支持，该项目旨在识别和控制影响带内跃迁的能量、一致性和寿命的机制，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。这应该会在电子动力学中提供一个重要的控制因素。电子的光谱和动力学特征包括使用LAMP和红外激光光谱仪的稳态和皮秒时间分辨光学研究。该项目将湿法有机金属化学与纳米结构的广泛表征相结合，为培养光学材料科学前沿领域的研究生提供了一个极好的机会。纳米半导体粒子中的%电子对红外辐射非常敏感，这在中红外、从激光到探测器和夜视等领域都有潜在的应用。这一个人研究人员奖为发现和控制影响电子红外反应的机制的项目提供了支持。为了利用电子的光学响应可以通过纳米结构的大小、形状和组成来“设计”的灵活性，这是必要的。化学是用来将半导体颗粒制成溶液的。这些溶液很容易通过它们强烈的颜色表现出量子力学的效果，它们可以被加工成更实用的凝胶或具有相同性质的薄膜。这个项目结合了纳米材料的化学和光学，它为培养这一技术前景光明的材料科学领域的研究生提供了一个极好的机会。

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.***