Unravelling electronic dynamics in supramolecular semiconductors from femtoseconds to milliseconds

揭示超分子半导体从飞秒到毫秒的电子动力学

• 批准号: 311409-2008
• 负责人: Silva, Carlos
• 金额: $ 3.11万
• 依托单位: Université de Montréal
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=514834
• 关键词: Unravelling; electronic; dynamics; supramolecular; semiconductors

In supramolecular electronics, complex architectures are built with molecular 'bricks', and these structures are designed to have electronic properties that can be used as active components in electronic applications. For example, they may support electrical current in much the same way as silicon, a well-established semiconductor material. This enables fabrication of displays, solar cells, and other electronic devices with materials that are essentially plastics. These materials have caused considerable excitement in the scientific community. Useful applications of these so-called organic semiconductors depend upon the controlled interactions between molecules, and benefit from well-defined intermolecular structure. For example, the efficiency of charge transport is enhanced when molecules adopt ordered conformations with molecular interactions in a direction parallel to the transport direction. Our objectives are to measure, in real time, processes that are important in electronic applications of these nanostructures. We will do so by starting electronic events with short laser pulses (shorter than a millionth of a millionth of a second) and following the time evolution of those processes by mapping light emission or absorption of another laser pulse after the initiating laser burst. Understanding electronic processes in these new and exciting materials is essential for further development of organic electronics beyond incremental optimisation of materials and device parameters. However, the understanding obtained from this programme will have profound implications for other areas of science. For example, we will develop comparisons with light harvesting in photosynthesis and energy transport in DNA. Furthermore, this research is timely because of recent development of model materials to correlate unambiguously structure with electronic dynamics. This work takes advantage of the synergistic efforts of chemists and physicists to design new materials for electronic applications.

在超分子电子学中，复杂的结构是用分子“砖”建造的，这些结构被设计成具有可以用作电子应用中的有源元件的电子特性。例如，它们可以以与硅（一种公认的半导体材料）大致相同的方式支持电流。这使得能够用基本上是塑料的材料制造显示器、太阳能电池和其他电子设备。这些材料在科学界引起了相当大的兴奋。这些所谓的有机半导体的有用应用取决于分子之间的受控相互作用，并受益于明确定义的分子间结构。例如，当分子采用在平行于传输方向的方向上具有分子相互作用的有序构象时，电荷传输的效率增强。我们的目标是测量，在真实的时间，这些纳米结构的电子应用程序是重要的过程。我们将通过短激光脉冲（短于百万分之一秒的百万分之一）启动电子事件，并通过映射初始激光爆发后另一个激光脉冲的光发射或吸收来跟踪这些过程的时间演化。了解这些令人兴奋的新材料中的电子过程对于有机电子产品的进一步发展至关重要，而不仅仅是材料和器件参数的增量优化。然而，从该计划中获得的理解将对其他科学领域产生深远的影响。例如，我们将与光合作用中的光收集和DNA中的能量传输进行比较。此外，这项研究是及时的，因为最近开发的模型材料，明确关联的结构与电子动力学。这项工作利用化学家和物理学家的协同努力来设计电子应用的新材料。