Experimental and theoretical studies of the electronic structure of Na-doped poly (para-phenylenevinylene)

M. Fahlman, D. Beljonne, M. Lögdlund, R. H. Friend, A. B. Holmes, J. L. Brédas, W. R. Salaneck

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The electronic structure of sodium-doped poly (p-phenylenevinylene), or PPV, has been studied using photoelectron spectroscopy, UPS and XPS. Upon doping, two new states are created in the previously forbidden electronic bandgap. No finite density- of-states is observed at the Fermi energy. The UPS spectra are analysed with the help of VEH-level quantum chemical calculations. It is determined that the Na-doping of PPV results in the formation of bipolaron bands in the otherwise forbidden energy gap at saturation doping. These results are in contrast with the case of poly-hexyl-thiophene doped from NOPF6, where the existence of a finite density-of-states at EF and a stable polaron lattice was observed at saturation doping at room temperature. This work represents the first direct measure of multiple, resolved gap states in a doped conjugated polymer.

Original languageEnglish (US)
Pages (from-to)327-332
Number of pages6
JournalChemical Physics Letters
Issue number3-4
StatePublished - Nov 5 1993
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry

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