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Effect of nanotube coupling on exciton transport in polymer-free monochiral semiconducting carbon nanotube networks

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Abstract

Semiconducting single-walled carbon nanotubes (s-SWCNTs) are attractive light-harvesting components for solar photoconversion schemes and architectures, and selective polymer extraction has emerged as a powerful route to obtain highly pure s-SWCNT samples for electronic applications. Here we demonstrate a novel method for producing electronically coupled thin films of near-monochiral s-SWCNTs without wrapping polymer. Detailed steady-state and transient optical studies on such samples provide new insights into the role of the wrapping polymer on controlling intra-bundle nanotube–nanotube interactions and exciton energy transfer within and between bundles. Complete removal of polymer from the networks results in rapid exciton trapping within nanotube bundles, limiting long-range exciton transport. The results suggest that intertube electronic coupling and associated exciton delocalization across multiple tubes can limit diffusive exciton transport. The complex relationship observed here between exciton delocalization, trapping, and long-range transport, helps to inform the design, preparation, and implementation of carbon nanotube networks as active elements for optical and electronic applications.

Graphical abstract: Effect of nanotube coupling on exciton transport in polymer-free monochiral semiconducting carbon nanotube networks

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Publication details

The article was received on 11 Sep 2019, accepted on 21 Oct 2019 and first published on 22 Oct 2019


Article type: Paper
DOI: 10.1039/C9NR07821E
Nanoscale, 2019, Advance Article

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    Effect of nanotube coupling on exciton transport in polymer-free monochiral semiconducting carbon nanotube networks

    D. H. Arias, D. B. Sulas-Kern, S. M. Hart, H. S. Kang, J. Hao, R. Ihly, J. C. Johnson, J. L. Blackburn and A. J. Ferguson, Nanoscale, 2019, Advance Article , DOI: 10.1039/C9NR07821E

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