Low band gap and ionic bonding with charge transfer threshold in the polymeric lithium fulleride Li4C60

Roberto Macovez, Rebecca Savage, Luc Venema, Joachim Schiessling, K. Kamarás, Petra Rudolf

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We demonstrate the growth of crystalline Li4C60 films. The low-energy electron diffraction pattern of the films indicates the formation of polymer chains in the plane of the surface, consistent with the reported crystal structure. Electron energy loss and photoemission spectra identify the Li4C60 polymer as a low band gap semiconductor, with a relatively strong coupling of electrons to low-frequency stretching modes of the polymer bonds and alkali phonons. No evidence is found for hybridization between the Li- and fullerene-derived electronic states. Instead, a partial charge transfer takes place, which is the same for different Li concentrations. This result rationalizes the stability of the polymer phase over a wide range of stoichiometrics.

Original languageEnglish
Pages (from-to)2988-2996
Number of pages9
JournalJournal of Physical Chemistry C
Volume112
Issue number8
DOIs
Publication statusPublished - Feb 28 2008

Fingerprint

fullerides
Lithium
Charge transfer
Polymers
Energy gap
lithium
charge transfer
thresholds
polymers
Fullerenes
Electrons
Low energy electron diffraction
Alkalies
Photoemission
Electronic states
Phonons
Diffraction patterns
Stretching
fullerenes
alkalies

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Low band gap and ionic bonding with charge transfer threshold in the polymeric lithium fulleride Li4C60. / Macovez, Roberto; Savage, Rebecca; Venema, Luc; Schiessling, Joachim; Kamarás, K.; Rudolf, Petra.

In: Journal of Physical Chemistry C, Vol. 112, No. 8, 28.02.2008, p. 2988-2996.

Research output: Contribution to journalArticle

Macovez, Roberto ; Savage, Rebecca ; Venema, Luc ; Schiessling, Joachim ; Kamarás, K. ; Rudolf, Petra. / Low band gap and ionic bonding with charge transfer threshold in the polymeric lithium fulleride Li4C60. In: Journal of Physical Chemistry C. 2008 ; Vol. 112, No. 8. pp. 2988-2996.
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