Tracking single charges in organic semiconductors by surface enhanced Raman scattering

通过表面增强拉曼散射追踪有机半导体中的单电荷

• 批准号: 0748473
• 负责人: John Lupton
• 金额: $ 30万
• 依托单位: University of Utah
• 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: 2008-02-15 至 2011-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0748473&HistoricalAwards=false
• 关键词: Tracking; single; charges; organic; semiconductors

Prof. Lupton and his group at the University of Utah, with the support of the Analytical and Surface Chemistry Program in the Chemistry Division of the National Science Foundation, will develop and utilize ultra-sensitive spectroscopic techniques to unravel the structural and electronic properties underlying the function of organic semiconductors. By applying Raman spectroscopy to single semiconducting organic molecules, highly local changes in the intramolecular charge density which affects the interatomic separation can be revealed through the characteristic vibrational fingerprints. The project seeks to identify signatures of molecular charging through a change in vibrational frequency. The surface enhanced Raman scattering (SERS) effect dramatically amplifies the selectivity of Raman spectroscopy. This amplification should make it possible to pick out individual charging events within a working device such as an organic light-emitting diode (OLED), enabling a direct tracking of charge migration.The project's uniqueness stems from a synergy between the two fields of organic semiconductors and SERS. While SERS is new as an analytical tool in the study of organic semiconductors, conjugated polymers in particular have recently proven to be excellent materials for the investigation of the underlying physics of SERS itself. Further improvements to the reproducibility, stability, selectivity and sensitivity of SERS are therefore anticipated to come out of this project. The highly interdisciplinary nature of the research necessitates a range of collaborations on and off campus, providing a versatile training background for the students engaged with the venture.

犹他大学的拉普顿教授和他的团队在美国国家科学基金会化学部分析和表面化学项目的支持下，将开发和利用超灵敏光谱技术来揭示有机半导体功能背后的结构和电子特性。 通过将拉曼光谱应用于单个半导体有机分子，可以通过特征振动指纹揭示影响原子间分离的分子内电荷密度的高度局部变化。该项目试图通过振动频率的变化来识别分子充电的特征。表面增强拉曼散射 (SERS) 效应极大地增强了拉曼光谱的选择性。这种放大应该能够识别出有机发光二极管 (OLED) 等工作器件内的各个充电事件，从而能够直接跟踪电荷迁移。该项目的独特性源于有机半导体和 SERS 两个领域之间的协同作用。虽然 SERS 作为有机半导体研究中的新分析工具，但最近已证明共轭聚合物是研究 SERS 本身基础物理的优异材料。因此，预计该项目将进一步提高 SERS 的再现性、稳定性、选择性和灵敏度。该研究的高度跨学科性质需要在校内外进行一系列合作，为参与该项目的学生提供多功能的培训背景。