We present surface photovoltage (SPV) measurements of metal nanostructures on Si(111)-(7 Â 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 Â 7) are compared to results of a Si (111)
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