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Surface photovoltage of Ag nanoparticles and Au chains on Si(111)
Author(s) -
Sell Kristian,
Barke Ingo,
Polei Stefan,
Schumann Christian,
von Oeynhausen Viola,
MeiwesBroer KarlHeinz
Publication year - 2010
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200945577
Subject(s) - surface photovoltage , work function , scanning tunneling microscope , materials science , nanostructure , spectroscopy , fermi level , laser , nanoparticle , scanning tunneling spectroscopy , spectral line , optoelectronics , molecular physics , analytical chemistry (journal) , optics , nanotechnology , chemistry , physics , quantum mechanics , layer (electronics) , astronomy , chromatography , electron
Abstract We 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.