Giant Negative Terahertz Photoconductivity in Controllably Doped Carbon Nanotube Networks

Maria G. Burdanova; Alexey P. Tsapenko; Daria A. Satco; Reza Kashtiban; Connor D.W. Mosley; Maurizio Monti; Michael Staniforth; Jeremy Sloan; Yuriy G. Gladush; Albert G. Nasibulin; James Lloyd-Hughes

doi:10.1021/acsphotonics.9b00138

Giant Negative Terahertz Photoconductivity in Controllably Doped Carbon Nanotube Networks

Maria G. Burdanova^*
, Alexey P. Tsapenko
, Daria A. Satco
, Reza Kashtiban
, Connor D.W. Mosley
, Maurizio Monti
, Michael Staniforth
, Jeremy Sloan
, Yuriy G. Gladush
, Albert G. Nasibulin
, James Lloyd-Hughes

^*Corresponding author for this work

Department of Applied Physics

University of Warwick
Skolkovo Institute of Science and Technology

Research output: Contribution to journal › Article › Scientific › peer-review

48 Citations (Scopus)

Abstract

A strong negative photoconductivity was identified in thin film networks of single-walled carbon nanotubes using optical pump, THz probe spectroscopy. The films were controllably doped, using either adsorption doping with different p-type dopant concentrations or ambipolar doping using an ionic gate. While doping enhanced the THz conductivity and increased the momentum scattering rate, interband photoexcitation lowered the spectral weight and reduced the momentum scattering rate. This negative THz photoconductivity was observed for all doping levels, regardless of the chemical potential, and decayed within a few picoseconds. The strong many-body interactions inherent to these 1D conductors led to trion formation under photoexcitation, lowering the overall conductivity of the carbon nanotube network. The large amplitude of negative THz photoconductivity and the tunability of its recovery time with doping offer promise for spectrally wide-band ultrafast devices, including THz detectors, polarizers, and modulators.

Original language	English
Pages (from-to)	1058-1066
Number of pages	9
Journal	ACS Photonics
Volume	6
Issue number	4
DOIs	https://doi.org/10.1021/acsphotonics.9b00138
Publication status	Published - 17 Apr 2019
MoE publication type	A1 Journal article-refereed

Funding

The U.K. authors would like to thank the EPSRC (UK) for support under grants EP/N010825/1, EP/M010643/1, and EP/R019428/1. M.G.B. would like to thank the Russian Government for financial support (Global Education Program). D.A.S., Y.G.G., and A.G.N. acknowledge the Russian Science Foundation (Project 17-19-01787), and A.P.T. acknowledges RFBR (Project 18-32-00246), for partial financial support. Data related to this publication is available from the University of Warwick data archive at http://wrap.warwick.ac.uk/114910.

Keywords

carbon nanotubes
negative photoconductivity
terahertz spectroscopy

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10.1021/acsphotonics.9b00138

Cite this

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title = "Giant Negative Terahertz Photoconductivity in Controllably Doped Carbon Nanotube Networks",

abstract = "A strong negative photoconductivity was identified in thin film networks of single-walled carbon nanotubes using optical pump, THz probe spectroscopy. The films were controllably doped, using either adsorption doping with different p-type dopant concentrations or ambipolar doping using an ionic gate. While doping enhanced the THz conductivity and increased the momentum scattering rate, interband photoexcitation lowered the spectral weight and reduced the momentum scattering rate. This negative THz photoconductivity was observed for all doping levels, regardless of the chemical potential, and decayed within a few picoseconds. The strong many-body interactions inherent to these 1D conductors led to trion formation under photoexcitation, lowering the overall conductivity of the carbon nanotube network. The large amplitude of negative THz photoconductivity and the tunability of its recovery time with doping offer promise for spectrally wide-band ultrafast devices, including THz detectors, polarizers, and modulators.",

keywords = "carbon nanotubes, negative photoconductivity, terahertz spectroscopy",

author = "Burdanova, \{Maria G.\} and Tsapenko, \{Alexey P.\} and Satco, \{Daria A.\} and Reza Kashtiban and Mosley, \{Connor D.W.\} and Maurizio Monti and Michael Staniforth and Jeremy Sloan and Gladush, \{Yuriy G.\} and Nasibulin, \{Albert G.\} and James Lloyd-Hughes",

year = "2019",

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doi = "10.1021/acsphotonics.9b00138",

language = "English",

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AU - Burdanova, Maria G.

AU - Tsapenko, Alexey P.

AU - Satco, Daria A.

AU - Kashtiban, Reza

AU - Mosley, Connor D.W.

AU - Monti, Maurizio

AU - Staniforth, Michael

AU - Sloan, Jeremy

AU - Gladush, Yuriy G.

AU - Nasibulin, Albert G.

AU - Lloyd-Hughes, James

PY - 2019/4/17

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N2 - A strong negative photoconductivity was identified in thin film networks of single-walled carbon nanotubes using optical pump, THz probe spectroscopy. The films were controllably doped, using either adsorption doping with different p-type dopant concentrations or ambipolar doping using an ionic gate. While doping enhanced the THz conductivity and increased the momentum scattering rate, interband photoexcitation lowered the spectral weight and reduced the momentum scattering rate. This negative THz photoconductivity was observed for all doping levels, regardless of the chemical potential, and decayed within a few picoseconds. The strong many-body interactions inherent to these 1D conductors led to trion formation under photoexcitation, lowering the overall conductivity of the carbon nanotube network. The large amplitude of negative THz photoconductivity and the tunability of its recovery time with doping offer promise for spectrally wide-band ultrafast devices, including THz detectors, polarizers, and modulators.

AB - A strong negative photoconductivity was identified in thin film networks of single-walled carbon nanotubes using optical pump, THz probe spectroscopy. The films were controllably doped, using either adsorption doping with different p-type dopant concentrations or ambipolar doping using an ionic gate. While doping enhanced the THz conductivity and increased the momentum scattering rate, interband photoexcitation lowered the spectral weight and reduced the momentum scattering rate. This negative THz photoconductivity was observed for all doping levels, regardless of the chemical potential, and decayed within a few picoseconds. The strong many-body interactions inherent to these 1D conductors led to trion formation under photoexcitation, lowering the overall conductivity of the carbon nanotube network. The large amplitude of negative THz photoconductivity and the tunability of its recovery time with doping offer promise for spectrally wide-band ultrafast devices, including THz detectors, polarizers, and modulators.

KW - carbon nanotubes

KW - negative photoconductivity

KW - terahertz spectroscopy

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ER -

Giant Negative Terahertz Photoconductivity in Controllably Doped Carbon Nanotube Networks

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Keywords

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