SGER: Spin-Polarized Electronic Processes in Conjugated Polymer Optoelectronic Devices

SGER：共轭聚合物光电器件中的自旋极化电子过程

• 批准号: 0521474
• 负责人: Bin Hu
• 金额: $ 7.98万
• 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: 2005-05-01 至 2006-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0521474&HistoricalAwards=false
• 关键词: SGER; Spin; Polarized; Electronic; Processes

Organic conjugated polymers are a new class of semiconducting materials and have demonstrated significant applications in large-area and flexible thin-film optoelectronic devices based on two unique features: convenient material processability and facile property-tuning. As compared with inorganic semiconductors, polymers have an important distinct feature: coexistence of differently spin-configured singlet and triplet states. As a result, a net spin-polarization due to external spin-polarized charge transfer or spin injection should have a significant impact on the electronic processes associated with the singlet and triplet states, and may open a new direction to control the optoelectronic properties of organic conjugated polymer devices based on magnetic interactions.Objective: This project seeks to investigate a critically important issue: effects of spinpolarized charge transfer on singlet and triplet exciton formation and singlet-triplet intersystem crossing in organic semiconducting polymers. With one-year support, this SGER will develop a solid interdisciplinary research program that will comprehensively study the effects of spin injection and transfer on (i) exciton dissociation of photogenerated polarized excitons (photovoltaics), (ii) spin-polarized charge trapping and releasing (nonvolatile memory), (iii) spin polarized electron-hole recombination (electroluminescence), and (iv) spin dependent exciton-exciton coherence (lasing actions) in organic n-conjugated materials.Intellectual merit: This project necessitates a truly interdisciplinary research effort, including: i) synthesis and processing of conjugated polymers and ferro-magnetic nanomaterials, ii) device fabrication, iii) advanced characterization of optoelectronic and magnetic properties. The approach is to first understand spin-polarized charge transfer from magnetic nano-materials to conjugated polymer chains. Secondly, the effects of spin transfer on polymer optoelectronic properties will be systematically investigated. Finally, mechanism of magnetic dependent exciton formation and intersystem crossing will be elucidated. The proposed studies are expected to increase our understanding on how magnetic properties affect the optoelectronic processes in organic materials, and thus will lead to magnetically enhanced functionalities and performance of organic devices.Broad impact: The project will develop a guideline of how to mutually control magnetic and semiconducting properties, and hence will significantly contribute to the development of multifunctional semiconducting magnetic organic materials for large-area and flexible optoelectronic and spintronic applications. The research consists of crossfield investigations that will provide multi-disciplinary training in optics, electronics, and magnetics to the involved graduate and undergraduate students by exposing them to problems related to the development of organic optoelectronic and spintronic materials and devices. To further enhance its educational impact, this SGER will develop new course work for Polymer Physics (MSE 543) and Optoelectronic Processes in Polymeric Materials and Devices (MSE 674) at the University of Tennessee.

有机共轭聚合物是一类新的半导体材料，它在大面积和灵活的薄膜光电式设备中表现出了重要的应用，该设备基于两个独特的功能：方便的材料加工性和便捷性能调整。与无机半导体相比，聚合物具有重要的不同特征：不同自旋配置的单线和三重态的共存。 As a result, a net spin-polarization due to external spin-polarized charge transfer or spin injection should have a significant impact on the electronic processes associated with the singlet and triplet states, and may open a new direction to control the optoelectronic properties of organic conjugated polymer devices based on magnetic interactions.Objective: This project seeks to investigate a critically important issue: effects of spinpolarized charge transfer on singlet and triplet exciton formation and有机半导体聚合物中的单线 - 三个跨系统交叉。借助一年的支持，该SGER将制定一个稳定的跨学科研究计划，该计划将全面研究自旋注射和转移对（i）（i）（i）（i）光生式极化激子（光伏型）的激子解离（（ii）自旋极化电荷捕获和释放的电荷捕获和释放（非电感）旋转旋转式（III），（III），（III），（III）电子脱层（III），（III），（III），（III） exciton-exciton coherence (lasing actions) in organic n-conjugated materials.Intellectual merit: This project necessitates a truly interdisciplinary research effort, including: i) synthesis and processing of conjugated polymers and ferro-magnetic nanomaterials, ii) device fabrication, iii) advanced characterization of optoelectronic and magnetic properties.该方法是首先了解从磁性纳米材料到共轭聚合物链的自旋偏振电荷转移。其次，将系统研究自旋转移对聚合物光电子特性的影响。最后，将阐明磁相关激子形成和间间交叉的机理。预计拟议的研究将提高我们对磁性如何影响有机材料中光电过程的理解，从而导致磁性增强的功能和有机设备的性能。BOROAD的影响：该项目将制定如何制定相互控制的磁性和半导体的指南，从而有助于对大型磁性和较大的磁性构造和灵活的磁性构想的开发，并有助于多功能的磁性和弹性，并具有多功能的磁性和型号的开发。 Spintronic应用。该研究包括Crossfield调查，该调查将为所涉及的研究生和本科生提供有关光学，电子和磁学的多学科培训，以使其暴露于与有机光电和自旋材料和设备的发展有关的问题。为了进一步增强其教育影响，该SGER将在田纳西大学的聚合物材料和设备（MSE 674）中开发新的聚合物物理学课程（MSE 543）和光电过程。