Molecular Photonic Materials

分子光子材料

• 批准号: 1465060
• 负责人: Gerald Meyer
• 金额: $ 48万
• 依托单位: University of North Carolina at Chapel Hill
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-08-01 至 2018-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1465060&HistoricalAwards=false
• 关键词: Molecular; Photonic; Materials

In this project funded by the Chemical Structure, Dynamic & Mechanism B Program of the Chemistry Division, Professor Gerald Meyer of the Department of Chemistry at The University of North Carolina - Chapel Hill will develop new classes of molecular materials with interesting optoelectronic properties. The goal of this research is to understand the fundamental nature of interactions between light-absorbing, redox-active molecules anchored to metal oxide surfaces. Optimization of desired interactions will enable applications for the conversion of sunlight to electrical power. The project required inorganic and materials synthesis as well as solar cell fabrication that is well suited to the education of scientists at all levels. This group is also well-positioned to provide the highest level of education and training for students underrepresented in science. Outreach activities for K-12 students involving presentations at the local library and Science Center will also be part of the funded project. Transition metal polypyridyl complexes display a rich array of photophysical and electron transfer properties when anchored to oxide surfaces. The proposed studies focus on lateral intermolecular electron- and energy-transfer self-exchange reactions that provide a molecular basis for the transport of charge or energy across the oxide surface. The redox activity will be exploited as a new class of 'hole-transport' materials for application in solar cells. A newly developed time-resolved polarization anisotropy technique will be exploited to characterize lateral charge transfer reactions that may occur after excited state injection into wide band gap semiconducting oxides such as TiO2. These studies will be complimented by thermal electron transfer studies and modelling through Monte Carlo simulations. A fundamental goal is to establish how molecular structure influences the lateral self-exchange rate constants. Particular attention will be placed on Cu(II/I) and Co(II/I) self-exchange reactions that involve transfer of an electron and a ligand, behavior that may result in what has been termed structurally 'gated' electron transfer. The Marcus cross-relation will be tested to elucidate whether lateral electron transfer reactions that involve chemical change can be accurately predicted with the measured self-exchange rate constants.

在这个由化学部化学结构、动力学和机理 B 项目资助的项目中，北卡罗来纳大学教堂山分校化学系的 Gerald Meyer 教授将开发具有有趣光电特性的新型分子材料。 这项研究的目的是了解固定在金属氧化物表面的光吸收、氧化还原活性分子之间相互作用的基本性质。 所需相互作用的优化将使将阳光转化为电能的应用成为可能。该项目需要无机和材料合成以及太阳能电池制造，非常适合各级科学家的教育。 该群体也有能力为科学领域代表性不足的学生提供最高水平的教育和培训。 针对 K-12 学生的外展活动（包括在当地图书馆和科学中心进行演讲）也将成为资助项目的一部分。 当固定在氧化物表面时，过渡金属聚吡啶配合物表现出丰富的光物理和电子转移特性。 拟议的研究重点是横向分子间电子和能量转移自交换反应，为跨越氧化物表面的电荷或能量传输提供分子基础。 氧化还原活性将被开发为一种新型“空穴传输”材料，用于太阳能电池。 新开发的时间分辨极化各向异性技术将用于表征在激发态注入宽带隙半导体氧化物（如 TiO2）后可能发生的横向电荷转移反应。 这些研究将得到热电子转移研究和蒙特卡罗模拟建模的补充。 一个基本目标是确定分子结构如何影响横向自交换速率常数。 将特别关注涉及电子和配体转移的 Cu(II/I) 和 Co(II/I) 自交换反应，这种行为可能导致所谓的结构“门控”电子转移。 将测试马库斯交叉关系，以阐明是否可以通过测量的自交换速率常数准确预测涉及化学变化的横向电子转移反应。