Low bandgap and ionic bonding with charge transfer threshold in thin-film polymeric Li4C60
TL;DRAbstract
We demonstrate the growth of crystalline Li(4)C(60) films. The low-energy electron diffraction pattern of the \nfilms indicates the formation of polymer chains in the plane of the surface, consistent with the reported \ncrystal structure. Electron energy loss and photoemission spectra identify the Li(4)C(60) polymer as a low band \ngap semiconductor, with a relatively strong coupling of electrons to low-frequency stretching modes of the \npolymer bonds and alkali phonons. No evidence is found for hybridization between the Li- and fullerenederived \nelectronic states. Instead, a partial charge transfer takes place, which is the same for different Li \nconcentrations. This result rationalizes the stability of the polymer phase over a wide range of stoichiometries.
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We demonstrate the growth of crystalline Li(4)C(60) films. The low-energy electron diffraction pattern of the \nfilms indicates the formation of polymer chains in the plane of the surface, consistent with the reported \ncrystal structure. Electron energy loss and photoemission spectra identify the Li(4)C(60) polymer as a low band \ngap semiconductor, with a relatively strong coupling of electrons to low-frequency stretching modes of the \npolymer bonds and alkali phonons. No evidence is found for hybridization between the Li- and fullerenederived \nelectronic states. Instead, a partial charge transfer takes place, which is the same for different Li \nconcentrations. This result rationalizes the stability of the polymer phase over a wide range of stoichiometries.
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