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In recent years, there have been conflicting reports regarding the ultrafastphotoconductive 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 ahighly variable quantity which correlates with the length of the CNTs, whilethe chirality distribution has little influence. Moreover, by comparing thephoto-induced change in THz conductivity with heat-induced changes, we showthat both occur primarily due to heat-generated modification of the Drudeelectron relaxation rate, resulting in a broadening of the plasmonic resonancepresent in finite-length metallic and doped semiconducting CNTs. This clarifiesthe nature of the photo-response of CNT films and demonstrates the need tocarefully consider the geometry of the CNTs, specifically the length, whenconsidering them for application in optoelectronic devices.

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