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

本项目旨在研究含量子点的杂化聚合物纳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。这些研究将针对电荷载流子的光产生和传输机制，以及含有量子点作为光敏剂的材料中折射率光栅的发展。重点研究了红外光敏化过程将光折变灵敏度扩展到通信波长，以及多激子产生诱导载流子倍增的过程，以显著改善在较短波长的光折变性能。纳米复合材料将包括工程半导体纳米粒子(量子点，量子点)，如纳米棒，通过将量子点连接到碳纳米管，并通过使用流动性增强组件，如并五苯。该项目将把重点放在培养少数民族学生和研究人员上，这是我校的优先事项。他们将参与涉及纳米技术、光子学和光谱学的高度多学科的研究。%该项目将对光电子和光伏产生广泛的影响，导致使用载流子倍增的更好的紫外线(UV)探测器，以及能够从UV到红外(IR)收集光子的宽带、高效的光伏和太阳能电池。利用载流子倍增的光电子器件将通过有效地利用现成的深紫外光光子而在空间应用中特别有用。该项目将把重点放在培养少数民族学生和研究人员上，这是我校的优先事项。

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.