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  Niederhausen, J.; Amsalem, P.; Wilke, A.; Schlesinger, R.; Winkler, S.; Vollmer, A.; Rabe, J.P.; Koch, N.: Doping of C₆₀ (sub)monolayers by Fermi-level pinning induced electron transfer. Physical Review B 86 (2012), p. 081411(R)/1-5

10.1103/PhysRevB.86.081411
Open Access Version (externer Anbieter)

Abstract:
Fermi-level pinning of C60 (sub)-monolayers on a sexithiophene (6T) bilayer grown on Ag(111) is shown to induce electron transfer from the metal to a fraction of the C60 molecules. The electrostatic potential resulting from the charge transfer process is responsible for a potential drop within the 6T interlayer and, more remarkably, for dipole-dipole repulsion, leading to a disproportionation into coexisting neutral and charged C60 molecules. We suggest that charge ordering phenomena may occur for such systems.