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Low band gap and ionic bonding with charge transfer, threshold in the polymeric lithium fulleride Li4C60
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
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2008 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 112, no 8, 2988-2996 p.Article in journal (Refereed) Published
Abstract [en]

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 stoichiometries.

Place, publisher, year, edition, pages
2008. Vol. 112, no 8, 2988-2996 p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-112403DOI: 10.1021/jp077632tISI: 000253355700028OAI: oai:DiVA.org:uu-112403DiVA: diva2:286161
Available from: 2010-01-14 Created: 2010-01-13 Last updated: 2017-12-12

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