Effect of Illumination on the Preferred Oxygen Initial Adsorption Sites at a Si(111)7×7 Surface

Abstract

A p-Si(111)7×7 surface was exposed to oxygen both while being illuminated with super-band-gap energy photons and while in the dark. The initial sticking probability into an adsorption mode that appears as a protrusion in scanning tunneling microscope images doubled due to illumination with 500 mW/cm 2 532 nm light. No changes were observed in the ∼3:1 preference of the "faulted" over the "unfaulted" halves of the 7×7 unit cell. However, exposure to O 2 under illumination removed the ∼5:1 preference of the "corner adatom" over the "center adatom" sites, which was observed after exposure in the dark.

Molecular simulation study of alkyl monolayers on the Si(111) surface

“…10 The properties of the monolayer on Si(111) surfaces have been studied by a variety of experimental methods such as X-ray photoelectron spectroscopy (XPS), [11][12][13][14] Fourier transform infrared absorption spectroscopy (FTIR), 15,16 scanning electron microscopy (SEM), 4 ellipsometry, 8,17 Auger electron spectroscopy (AES), 18 and scanning tunneling microscopy (STM). [19][20][21] These experimental results can help us to understand the densely packed, well-ordered monolayer on Si(111) surfaces.…”