Tuning the Current of Organic Semiconductors by Magnetic Fields

通过磁场调节有机半导体的电流

• 批准号: 0805220
• 负责人: Arthur Epstein
• 金额: $ 42.28万
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 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: 2008-06-15 至 2011-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0805220&HistoricalAwards=false
• 关键词: Tuning; Current; Organic; Semiconductors; Magnetic

Technical. This project combines a theoretical and experimental approach to address resistance, photoconductivity, light emission, photovoltaic, and field effect transistor response of organic- and polymer-based organic materials at room temperature and low magnetic fields (100 Oe), with the objective of establishing a broadly applicable model that describes and predicts mag-netic field effects at low fields. Experiments will be guided by predictions of competing mecha-nisms for low field behavior, magnetoresistance due to interconversion of singlets and triplets (MIST mechanism) and magnetic field control of bipolaron transport. Experiments will be car-ried out to explore the roles of chemical composition, processing, and microstructure to clarify and understand mechanisms or develop new models for magnetotransport in several classes of organic-based semiconductors including small molecules, oligomers, conjugated polymers, and non-conjugated polymers. Organic based LEDs with different spin-orbit and hyperfine interac-tion strengths will be fabricated and studied as a function of magnetic field and electric field. In particular, oligomers where there are long lived excitons and carbon-based material such as C60, graphene, where the hyperfine constant is anticipated to be negligible are of special interest. In situ EPR study of organic- and polymer-based LEDs will also be used to study spin transfer. Non-Technical. The project addresses fundamental research issues in a topical area of elec-tronic/photonic materials science having technological relevance. Basic understanding gained is expected to lead to improved device performance, and to allow design of other important com-ponents for future plastics electronics. Magnetic field effects in organic- and polymer-based semiconductors represents an emerging field in nanoscience with impact in areas such as or-ganic- and polymer based photovoltaics, light emitters, and spintronics. The project integrates re-search and education providing students with hands-on laboratory experience and training while conducting forefront research.

技术.该项目结合了理论和实验方法，以解决室温和低磁场（100 Oe）下有机和聚合物基有机材料的电阻，光电导，发光，光伏和场效应晶体管响应，目的是建立一个广泛适用的模型，描述和预测低场下的磁场效应。实验将通过预测低场行为的竞争机制、由于单线态和三线态相互转换的磁阻（MIST机制）和双极化子输运的磁场控制来指导。实验将进行探索化学成分，加工和微观结构的作用，以澄清和理解机制或开发新的模型，在几类有机基半导体，包括小分子，低聚物，共轭聚合物和非共轭聚合物的磁输运。我们将制作不同自旋轨道和超精细相互作用强度的有机发光二极管，并研究它们在磁场和电场作用下的变化。特别地，其中存在长寿命激子和碳基材料（例如C60、石墨烯）的低聚物（其中超精细常数预计可忽略不计）是特别感兴趣的。有机和聚合物基LED的原位EPR研究也将用于研究自旋转移。非技术性。该项目涉及电子/光子材料科学领域的基础研究问题，具有技术相关性。所获得的基本理解有望提高器件性能，并允许设计未来塑料电子产品的其他重要组件。有机和聚合物基半导体中的磁场效应代表了纳米科学中的一个新兴领域，其影响领域包括有机和聚合物基光致发光、光发射器和自旋电子学。该项目集研究和教育为一体，为学生提供实践实验室经验和培训，同时进行前沿研究。