Abstract
AbstractWe present surface photovoltage (SPV) measurements of metal nanostructures on Si(111)‐(7 × 7) using scanning tunneling microscopy and spectroscopy (STM/STS). Quantitative results are obtained from spatially resolved I(V) spectra under laser illumination. The SPV data of Ag nanoparticles deposited on Si(111)‐(7 × 7) are compared to results of a Si(111) surface partially covered by the quasi one‐dimensional Si(111)‐(5 × 2)‐Au structure. On the latter we determine the SPV as a function of laser power at different locations. An accurate value for the Fermi‐level pinning position of Si(111)‐(5 × 2)‐Au atomic chains is obtained. Based on these results we establish and discuss a simple model for the band topology. It is confirmed by spatially resolved local work function measurements utilizing the image‐state derived field‐emission resonances.
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