Electronic structure of C60 / graphite
P. A. Bruhwiler, P. Baltzer, S. Andersson, D. Arvanitis, N. Martensson
Abstract
We report temperature-dependent photoelectron spectra for a monolayer of C60 adsorbed on HOPG, as well as C 1s x-ray absorption. This extends a previous report which showed the close similarity between the spectrum of the HOMO for the two-dimensional overlayer and that of C60 in the gas phase. The present work shows that intermolecular and molecule-substrate vibrations contribute strongly to the spectral lineshape at room temperature. Thus, vibrational effects are shown to be crucial for the proper understanding of photoelectron spectra, and thus the charge transport properties, for C60 in contact with graphite and graphite-like materials.
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