Probing Carrier Dynamics in sp3-Functionalized Single-Walled Carbon Nanotubes with Time-Resolved Terahertz Spectroscopy

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 f...

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Veröffentlicht in:ACS nano 2022-06, Vol.16 (6), p.9401-9409
Hauptverfasser: Zheng, Wenhao, Zorn, Nicolas F, Bonn, Mischa, Zaumseil, Jana, Wang, Hai I
Format: Artikel
Sprache:eng
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Zusammenfassung: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.
ISSN:1936-0851
1936-086X
DOI:10.1021/acsnano.2c02199