Electronic states of a C70 monolayer on the surface of Ag(111)

Peng Wang, Liang Meng, Xiao Bo Wang, Yan Jun Li, Chun Qi Sheng, Jia Ou Wang, Hai Jie Qian, Kurash Ibrahim, Hong Nian Li

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We have investigated the electronic states of a C70monolayer on the surface of Ag(111) (1ML C70/Ag(111)) using synchrotron radiation photoelectron spectroscopy and soft x-ray absorption spectroscopy techniques. The experimental data exhibit metallic properties and at least 2.6e charge transfer per C70 molecule. The screening effect of Ag(111) on the electronic structure of C70 is remarkable; it greatly reduces or even eliminates the on-site Hubbard energy. The work functions of the C70 multilayer and monolayer are determined as 4.53eV and 4.52eV respectively. The energy levels of C70 align with the Fermi level of the Ag(111) substrate, and the shift of the vacuum level caused by C70 adsorption is negligible. Potassium doping indicates that 1ML C70/Ag(111) can still accommodate about nine electrons and that the sample remains metallic at any doping level.

Original languageEnglish
Article number395002
JournalJournal of Physics Condensed Matter
Issue number39
StatePublished - 5 Oct 2011
Externally publishedYes


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