Optical properties of potassium-doped polyacetylene

D. B. Tanner, G. L. Doll, A. M. Rao, P. C. Eklund, G. A. Arbuckle, A. G. MacDiarmid

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14 Scopus citations

Abstract

The optical reflectance of polyacetylene doped with high concentrations of potassium has been measured, and the optical properties estimated by Kramers-Kronig analysis. The samples, doped by a vapor-phase technique to y ≈ 0.08 and 0.18, showed strong doping-induced infrared absorption at ∼900, 1270, and 1390cm-1. These experiments were motivated by calculations of the infrared absorption which showed that whereas there are only small differences in the infrared spectra for isolated solitons and isolated polarons, there is a dramatic difference between the high-concentration polaron and soliton lattices. The shapes of the absorption spectra are rather similar but the absorption for the polaron lattice is 13 orders of magnitude weaker than that of the soliton lattice. The observation of these features at high doping levels is inconsistent with both the polaronic metal and strongly disordered Peierls insulator models for highly doped polyacetylene and furthermore suggests that solitonic defects maintain their integrity to very high doping levels.

Original languageEnglish (US)
Pages (from-to)75-79
Number of pages5
JournalSynthetic Metals
Volume141
Issue number1-2
DOIs
StatePublished - Mar 18 2004

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Keywords

  • Kramers-Kronig analysis
  • Peierls insulator models
  • Potassium-doped polyacetylene

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  • Cite this

    Tanner, D. B., Doll, G. L., Rao, A. M., Eklund, P. C., Arbuckle, G. A., & MacDiarmid, A. G. (2004). Optical properties of potassium-doped polyacetylene. Synthetic Metals, 141(1-2), 75-79. https://doi.org/10.1016/j.synthmet.2003.07.019