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: 2008
• 资助国家: 加拿大
• 起止时间: 2008-01-01 至 2009-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=396396
• 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“砖块”构建的，这些结构被设计为具有可用作电子应用中的有源组件的电子特性。例如，它们可以以与硅（一种成熟的半导体材料）大致相同的方式支持电流。这使得能够使用本质上是塑料的材料来制造显示器、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受控的相互作用，并受益于明确的分子间结构。例如，当分子采用有序构象且分子相互作用沿平行于传输方向的方向时，电荷传输的效率会提高。我们的目标是实时测量这些纳米结构的电子应用中重要的过程。为此，我们将用短激光脉冲（短于百万分之一秒）启动电子事件，并通过绘制启动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变。了解这些令人兴奋的新材料中的电子过程对于有机电子学的进一步发展至关重要，超越了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，因为最近开发了将结构与电子动力学明确关联起来的模型材料。这项工作利用化学家和物理学家的协同努力来设计用于电子应用的新材料。