Dynamics of Photogenerated Excitons, Charge Carriers and Reorientations of Chromophores in Photorefractive Polymeric Nanocomposites

光折变聚合物纳米复合材料中光生激子、载流子的动力学和发色团的重新取向

• 批准号: 0702372
• 负责人: Paras Prasad
• 金额: $ 39万
• 依托单位: SUNY at Buffalo
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-01-01 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0702372&HistoricalAwards=false
• 关键词: Dynamics; Photogenerated; Excitons; Charge; Carriers

This project aims to study the dynamics of various steps relevant to the occurrence of the photorefractive effect in hybrid polymeric nanocomposites containing quantum dots. The investigations will target the mechanisms of photogeneration and transport of charge carriers and the development of the refractive index grating in materials containing quantum dots acting as photosensitizers. The focus is on the process of photosensitization in the infrared to extend the photorefractive sensitivity to telecommunication wavelengths as well as on the process of multiexciton generation induced carrier multiplication to dramatically improve the photorefractive performance at shorter wavelengths. The nanocomposites will involve engineered semiconductor nanoparticles (quantum dots, QDs) such as nanopods, through attachment of the QDs to carbon nanotubes and through the use of mobility boosting components such as pentacene. The project will place emphasis on training of minority students and researchers, which is a priority at our university. They will be involved in highly multidisciplinary research involving nanotechnology, photonics and spectroscopy.%%%This project will impact broadly optoelectronics and photovoltaics, leading to better ultraviolet (UV) detectors using carrier multiplication, as well as broad band, highly efficient photovoltaic and solar cells capable of harvesting photons from UV to infrared (IR). The optoelectronic devices using carrier multiplication will be especially useful for space applications by efficiently using readily available deep UV photons. The project will place emphasis on training of minority students and researchers, which is a priority at our university.

本计画旨在研究含量子点的杂化聚合物奈米复合材料中，与光折变效应发生相关的各个步骤的动力学。这些研究将针对光生和电荷载流子传输的机制以及含有作为光敏剂的量子点的材料中折射率光栅的发展。重点是在红外光敏化的过程中，以延长光折变的灵敏度电信波长，以及在多激子产生诱导的载流子倍增的过程中，显着提高在较短的波长的光折变性能。纳米复合材料将涉及工程半导体纳米颗粒（量子点，QD），如纳米脚，通过连接的QD到碳纳米管和通过使用流动性提高组件，如并五苯。 该项目将侧重于培训少数民族学生和研究人员，这是我们大学的一个优先事项。他们将参与高度多学科的研究，涉及纳米技术，光子学和光谱学。该项目将广泛影响光电子学和光电子学，导致使用载波倍增的更好的紫外（UV）探测器，以及能够收集从UV到红外（IR）光子的宽带，高效光伏和太阳能电池。使用载流子倍增的光电器件将通过有效地使用容易获得的深紫外光子而特别适用于空间应用。该项目将侧重于培训少数民族学生和研究人员，这是我们大学的一个优先事项。