1. Fermi Level Engineering of Single-Walled Carbon Nanotubes by AuCI3 Doping.
- Author
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Ki Kang Kim, Jung Jun Bae, Hyeon Ki Park, Soo Min Kim, Hon-Zhang Geng, Kyung Ah Park, Hyeon-Jin Shin, Seon-Min Kim, Benayad, Anass, Jae-Young Choi, and Young Hee Lee
- Subjects
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CARBON nanotubes , *ABSORPTION spectra , *SPECTRUM analysis , *OPTICAL properties , *CHARGE transfer , *ABSORPTION - Abstract
Abstract: We investigated the modulation of optical properties of single-walled carbon nanotubes (SWCNTs) by AuCI3 doping. The van Hove singularity transitions (E11S, E22S, E11M) in absorption spectroscopy disappeared gradually with an increasing doping concentration and a new peak appeared at a high doping concentration. The work function was downshifted up to 0.42 eV by a strong charge transfer from the SWCNTs to AuCl3 by a high level of p-doping. We propose that this large work function shift forces the Fermi level of the SWCNTs to be located deep in the valence band, i.e., highly degenerate, creating empty van Hove singularity states, and hence the work function shift invokes a new asymmetric transition in the absorption spectroscopy from a deeper level to newly generated empty states. [ABSTRACT FROM AUTHOR]
- Published
- 2008
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