Nanoscale optical imaging of electronic and vibronic states in carbon nanotubes

碳纳米管中电子和振动状态的纳米级光学成像

• 批准号: 24779302
• 负责人: Professor Dr. Achim Hartschuh
• 金额: --
• 依托单位: Department Chemie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/24779302?language=en
• 关键词: Nanoscale; optical; imaging; electronic; vibronic

Based on their exceptional properties, single-walled carbon nanotubes (SWNTs) will eventually play an important role as nanometer-scale building-blocks for photonics, opto- and nanoelectronics. In a real SWNT however, different types of localized defects alter the desired properties such as the quasi-infinite spatial extent of excitonic band states. Furthermore, defect related trap states are discussed to be responsible for the extremely low photoluminescence quantum yield of SWNTs which is expected to limit their applicability in devices.We propose to study the electronic and vibronic properties of single SWNTs by near-field optical spectroscopy with a spatial resolution of 10 nm. We image the spatial extent of the photoluminescent excitonic states in a given SWNT and investigate the spectroscopic signatures of trap states to identify their physical origin. Our results will be of major significance for the understanding of the role of localized defects in quasi-infinite electronic systems. From this, device concepts that benefit from defects, as in the case of intentionally doped anorganic semiconductor materials, could be developed for SWNTs.

单壁碳纳米管（SWNTs）凭借其优异的性能，最终将在光子学、光电子学和纳米电子学的纳米级构建模块中发挥重要作用。然而，在真实的单壁碳纳米管中，不同类型的局部缺陷改变了所需的性质，例如激子带态的准无限空间范围。此外，缺陷相关的陷阱态被讨论负责极低的光致发光量子产率的单壁碳纳米管，这是预期限制其在devices.We的适用性提出了研究单壁碳纳米管的电子和振动性质的近场光学光谱的空间分辨率为10 nm。我们在一个给定的单壁碳纳米管的光致发光激子态的空间范围的图像和调查的陷阱态的光谱特征，以确定其物理起源。我们的结果对于理解局域缺陷在准无限电子系统中的作用具有重要意义。由此，可以为SWNT开发从缺陷中受益的器件概念，如在有意掺杂的无机半导体材料的情况下。