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.

在超分子电子设备中，复杂的体系结构是用分子“砖”构建的，这些结构被设计为具有可以用作电子应用中活性组件的电子特性。例如，它们可以与硅（一种已建立的半导体材料硅）几乎相同的方式支持电流。这可以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极大的兴奋。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，并受益于定义明确的分子间结构。例如，当分子在平行于转运方向的方向上采用有序构象时，电荷传输的效率得到提高。我们的目标是实时测量在这些纳米结构的电子应用中很重要的过程。我们将通过使用短激光脉冲（短于三分之一的一秒钟）开始电子事件来做到这一点，并在启动激光爆发后通过绘制光发射或吸收另一激光脉冲的吸收来进行这些过程的时间演变。了解这些新的和令人兴奋的材料中的电子过程对于进一步开发有机电子设备至关重要，而不是材料和设备参数的增量优化。但是，从该计划获得的理解将对其他科学领域产生深远的影响。例如，我们将在DNA中的光合作用和能量传输中开发与光收集的比较。此外，这项研究之所以及时，是因为最近开发了模型材料，以将明确结构与电子动力学相关联。这项工作利用了化学家和物理学家为电子应用设计新材料的协同努力。