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| - Determination of the Electronic Structure ofSelf-Assembled l-Cysteine/Au Interfaces UsingPhotoemission Spectroscopy
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| - The electronic and chemical structure of the interface between the amino acid l-cysteine and Au wasdetermined by photoemission spectroscopy (PES). l-Cysteine was deposited by repeatedly dipping Ausubstrates into solutions of l-cysteine in methanol with various concentrations. To enable repeat depositionwithout significant contamination, the dipping procedure was performed in a glovebox directly connectedto the ultrahigh vacuum (UHV) chamber in a N2 atmosphere. X-ray photoemission spectroscopy (XPS)measurements between deposition steps allowed to characterize the chemical interaction at the interfaceto be characterized. Ultraviolet photoemission spectroscopy (UPS) measurements yielded the orbital lineupat the interface as well as the highest occupied molecular orbital (HOMO) structure of l-cysteine. Thecharge injection barrier between the l-cysteine HOMO and the Au Fermi level was found to be 3.0 eV.The interface dipole between the Au substrate and the l-cysteine overlayer was determined to be 1.03 eV.The results also indicate the formation of an interface state ∼1.5 eV above the HOMO of the l-cysteine.
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