论文标题
探测SP $^{3} $的载体动力学 - 具有时间分辨的Terahertz光谱的功能化的单壁碳纳米管
Probing Carrier Dynamics in sp$^{3}$-Functionalized Single-Walled Carbon Nanotubes with Time-Resolved Terahertz Spectroscopy
论文作者
论文摘要
共价SP $^{3} $的受控介绍将缺陷置于半导体的单壁碳纳米管（SWCNT），从而引起了激子定位和红移的近红外发光。这些功能化的SWCNT的单光子发射特性使它们成为电动量子光源的有趣候选者。但是，SP $^{3} $缺陷对碳纳米管中的载体动力学和电荷运输的影响仍然是一个空旷的问题。在这里，我们使用超快，时间分辨的光泵Terahertz-probe光谱作为一种直接和定量的技术，以研究原始和功能化（6,5）SWCNT在分散体和薄膜中的显微镜和温度依赖性电荷转运性能。我们发现SP $^{3} $功能化增加了电荷载体散射，从而降低了纳米管载体的迁移率。结合SWCNT网络现场效应晶体管的电测量结果，这些数据使我们能够区分纳米管内带传输的贡献，SP $^{3} $缺陷散射和纳米管载体跳跃到纳米管网络的整体电荷运输属性。
The controlled introduction of covalent sp$^{3}$ defects into semiconducting single-walled carbon nanotubes (SWCNTs) gives rise to exciton localization and red-shifted near-infrared luminescence. The single-photon emission characteristics of these functionalized SWCNTs make them interesting candidates for electrically driven quantum light sources. However, the impact of sp$^{3}$ defects on the carrier dynamics and charge transport in carbon nanotubes remains an open question. Here, we use ultrafast, time-resolved optical-pump terahertz-probe spectroscopy as a direct and quantitative technique to investigate the microscopic and temperature-dependent charge transport properties of pristine and functionalized (6,5) SWCNTs in dispersions and thin films. We find that sp$^{3}$ functionalization increases charge carrier scattering, thus reducing the intra-nanotube carrier mobility. In combination with electrical measurements of SWCNT network field-effect transistors, these data enable us to distinguish between contributions of intra-nanotube band transport, sp$^{3}$ defect scattering and inter-nanotube carrier hopping to the overall charge transport properties of nanotube networks.
