Sign inversion in the terahertz photoconductivity of single-walled carbon nanotube films

Peter Karlsen, Mikhail V. Shuba, Polina P. Kuzhir, Albert G. Nasibulin, Patrizia Lamberti, Euan Hendry

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)
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In recent years, there have been conflicting reports regarding the ultrafast photoconductive response of films of single walled carbon nanotubes (CNTs), which apparently exhibit photoconductivities that can differ even in sign. Here, we observe explicitly that the THz photoconductivity of CNT films is a highly variable quantity which correlates with the length of the CNTs, while the chirality distribution has little influence. Moreover, by comparing the photoinduced change in THz conductivity with heat-induced changes, we show that both occur primarily due to heat-generated modification of the Drude electron relaxation rate, resulting in a broadening of the plasmonic resonance present in finite-length metallic and doped semiconducting CNTs. This clarifies the nature of the photoresponse of CNT films and demonstrates the need to carefully consider the geometry of the CNTs, specifically the length, when considering them for application in optoelectronic devices.

Original languageEnglish
Article number241404
Pages (from-to)1-6
JournalPhysical Review B
Issue number24
Publication statusPublished - 3 Dec 2018
MoE publication typeA1 Journal article-refereed

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