Abstract
Abstract We investigate the electron affinity change of the hydrogen-terminated diamond (100) surface with adsorption of C60 by means of ultraviolet photoelectron spectroscopy. X-ray photoelectron spectroscopy permits one to distinguish between the two materials of the same element and shows that there is no chemical bonding between the C60 molecules and the diamond substrate. The diamond (100)–(2×1):H surface presents a true negative electron affinity (NEA) of −1.1 eV and a high intensity NEA peak with a full width of half maximum of 250 meV. After successive evaporation of C60 the NEA values as well as the NEA peak decrease.
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