Amplitude-Mode Spectroscopy of Chemically Injected and Photogenerated Charge Carriers in Ssemiconducting Single-Walled Carbon Nanotubes

Shai Vardeny, Alan Phillips, Kira Thurman, Z. Vardeny, Jeffrey Blackburn

Research output: Contribution to journalArticlepeer-review

1 Scopus Citations


In one-dimensional semiconductors such as conjugated polymers and semiconducting single-walled carbon nanotubes (s-SWCNTs), injected charge carriers (electrons or holes) can have profound impacts on both electronic conductivity and optical spectra, even at low carrier densities. Understanding charge-related spectral features is a key fundamental challenge with important technological implications. Here, we employ a systematic suite of experimental and theoretical tools to understand the mid-infrared charge signatures of heavily p-type doped polymer-wrapped s-SWCNTs. Across a broad range of nanotube diameters, we find that hole charge carriers induce strong Fano anti-resonances in mid-infrared transmission spectra that correspond to defect-related (D-band) and in-plane tangential (G-band) Raman-active vibrational modes, along with anti-resonances arising from infrared (IR)-active polymer and SWCNT modes. We employ 13C isotope-labeled s-SWCNTs and a removable wrapping polymer to clarify the relative intensities, energies, and sources of all observed anti-resonances. Simulations performed with the “amplitude mode model” are used to quantitatively reproduce Raman spectra and also help to explain the outsized intensity of the D-band anti-resonance, relative to the G-band, observed for both moderately and degenerately doped s-SWCNTs. The results provide a framework for future studies of ground- and excited-state charge carriers in s-SWCNTs and a variety of low-dimensional materials. [Figure not available: see fulltext.]

Original languageAmerican English
Pages (from-to)5619-5625
Number of pages7
JournalNano Research
Issue number4
StatePublished - Apr 2023

Bibliographical note

Publisher Copyright:
© 2022, Tsinghua University Press.

NREL Publication Number

  • NREL/JA-5K00-83522


  • carbon nanotubes
  • charge carriers
  • doping
  • electron-phonon coupling
  • phonons


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