The controlled introduction of covalent sp³ 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 sp³ 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 sp³ 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, sp³ defect scattering and inter-nanotube carrier hopping to the overall charge transport properties of nanotube networks.

中文翻译：

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用时间分辨太赫兹光谱探测 sp3 功能化单壁碳纳米管中的载流子动力学

将共价sp ³缺陷受控引入半导体单壁碳纳米管 (SWCNT) 会引起激子局域化和红移近红外发光。这些功能化 SWCNT 的单光子发射特性使其成为电驱动量子光源的有趣候选者。然而，sp ³缺陷对碳纳米管中载流子动力学和电荷传输的影响仍然是一个悬而未决的问题。在这里，我们使用超快、时间分辨光泵太赫兹探针光谱作为直接和定量技术来研究分散体和薄膜中原始和功能化 (6,5) 单壁碳纳米管的微观和温度依赖性电荷传输特性。我们发现sp ³官能化增加电荷载流子散射，从而降低纳米管内载流子迁移率。结合 SWCNT 网络场效应晶体管的电气测量，这些数据使我们能够区分纳米管内带传输、sp ³缺陷散射和纳米管间载流子跳跃对纳米管网络整体电荷传输特性的贡献。