Low Band Gap and Ionic Bonding with Charge Transfer Threshold in the Polymeric Lithium Fulleride Li4C60
| Autor: | Roberto Macovez, L.C. Venema, Petra Rudolf, Katalin Kamarás, Joachim Schiessling, Rebecca Savage |
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| Přispěvatelé: | Surfaces and Thin Films, Zernike Institute for Advanced Materials |
| Rok vydání: | 2008 |
| Předmět: |
Band gap
ENERGY-LOSS-SPECTROSCOPY Ionic bonding chemistry.chemical_element Electronic structure Condensed Matter::Materials Science Partial charge X-RAY-DIFFRACTION Condensed Matter::Superconductivity HIGH-PRESSURE SOLID C-60 Physical and Theoretical Chemistry DIMER FORMATION Quantitative Biology::Biomolecules business.industry Chemistry Alkali metal Surfaces Coatings and Films Electronic Optical and Magnetic Materials TETRAGONAL C-60 ELECTRONIC-STRUCTURE Crystallography INFRARED VIBRATIONAL PROPERTIES General Energy Semiconductor Chemical physics C-60 MONOLAYERS X-ray crystallography PHASE-TRANSITIONS Lithium business |
| Zdroj: | Journal of Physical Chemistry C, 112(8), 2988-2996. AMER CHEMICAL SOC |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp077632t |
| Popis: | We demonstrate the growth of crystalline Li(4)C(60) 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 Li(4)C(60) 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. |
| Databáze: | OpenAIRE |
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