SGER: Spin Injection from Ferromagnetic Nanodot Electrode to Organic Semiconducting Conjugated Polymers

SGER：从铁磁纳米点电极到有机半导体共轭聚合物的自旋注射

• 批准号: 0551914
• 负责人: Bin Hu
• 金额: $ 6.5万
• 依托单位: University of Tennessee Knoxville
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-10-01 至 2006-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0551914&HistoricalAwards=false
• 关键词: SGER; Spin; Injection; Ferromagnetic; Nanodot

Objective: This SGER project seeks to understand the mechanism of recently observed spin injection across the Co/polymer nanoscale heterojunction. Specifically, we will use Xenon buffer layer assisted MBE (molecular beam epitaxy) growth to prepare Co/ nanodots with precisely tunable size and density on conjugated polymer thin films. Then, the spin-dependent transport across Co/polymer nano-heterojunction will be studied as a function of temperature by using four-tip STM (scanning tunneling microscope). In addition, polymer light-emitting diodes (LEDs) will be used as a tool to study how spin injection affects the singlet and triplet exciton formation and singlettriplet intersystem crossing in conjugated polymers based on steady and transient electroluminescence and photoluminescence. The goal is to increase the critical understanding of spin injection mechanism and to develop a new methodology of controlling exciton formation by using ferromagnetic nanoscale spin injector.Intellectual merit: The proposed studies of spin transport across the Co/polymer nano-heterojunction expects to elucidate the spin transport processes at the interface between ferromagnetic nanosize electrode and organic semiconductor polymer thin film. The understanding of the spin injection mechanism is critically important for the fabrication of efficient spin injectors in organic semiconductor devices. Especially, efficient spin injection will create a new pathway to magnetically control the singlet and triplet exciton formation and relevant optoelectronic properties in conjugated polymers. Therefore, the project will impact the light-emitting, lasing, and photovoltaic properties in easy-processing and property-tunable polymer semiconductor devices. Broad impact: The research consists of cross-field investigations and thus will provide multi-disciplinary training in optics, electronics, and magnetism to the involved graduate and undergraduate students. To further enhance its educational impact, new course work of spin transport will be developed for Polymer Physics (MSE 543) and Optoelectronic Processes in Polymeric Materials and Devices (MSE 674) at the University of Tennessee (UT). The project will also continue to demonstrate the concepts and principles of polymer optoelectronic devices to high school students through the Materials Camp co-sponsored by UT Department of Materials Science and Engineering.

目的：该SGER项目旨在了解在CO/聚合物纳米级异质结中最近观察到的自旋注射的机制。具体而言，我们将使用氙气缓冲层辅助MBE（分子束外延）生长来制备具有可调式尺寸和密度在共轭聚合物薄膜上的co/ nanodots。 然后，通过使用四个TIP STM（扫描隧道显微镜），将研究跨CO/聚合物纳米型结合结的自旋依赖性转运。此外，聚合物发光二极管（LED）将用作研究旋转注射如何影响基于稳定和短暂的电发光和光致发光的共轭聚合物中的单元和三重态激子形成和单体型互联系统交叉的工具。目的是增加对自旋注射机制的批判性理解，并通过使用铁磁纳米级旋转注射器来开发一种新的控制激子形成的方法。智能优点：拟议的对跨共聚/聚合物纳米异位结构的旋转传输的研究期望在互动型中，在互动式薄polorys electore anterode antoder andote andode nanosize Nanosize Nanosize Nanosize Electoder andode seledsize nyosize nyosize nyosize nyosize seledsize seledsize seledsize seledsize seprote。 对自旋注入机制的理解对于在有机半导体设备中制造有效的自旋注射器至关重要。特别是，有效的自旋注射将创建一种新的途径，以磁性控制单线和三重态激子形成以及共轭聚合物中相关的光电特性。 因此，该项目将影响易于加工和属性可调的聚合物半导体设备的发光，激光和光伏特性。 广泛的影响：该研究包括跨场调查，因此将向所涉及的研究生和本科生提供有关光学，电子和磁性的多学科培训。为了进一步增强其教育影响，将在田纳西大学（UT）（UT）的聚合物材料和设备（MSE 674）中开发针对聚合物物理（MSE 543）和光电工艺开发新的自旋运输课程。该项目还将继续通过UT材料科学与工程系共同赞助的材料营的材料训练营向高中学生展示聚合物光电设备的概念和原理。