Abstract
The Sr-induced ordered superstructures on the Si(100)-2×1 surface have been studied using ultrahigh vacuum scanning tunneling microscopy and low-energy electron diffraction (LEED) for metal coverages (θ) below one monolayer (ML). At very low coverages (θ≤0.01 ML) Sr atoms adsorb as isolated atoms or small clusters. At submonolayer coverages of ∼θ≥0.12 ML we have observed the alkali-earth metal chains, even at room temperature, that run perpendicular to the substrate dimer rows. It is found that the Sr rows form areas of (2×3) order for coverages θ about 1/3 ML after annealing at 800 °C whereas a (1×3) phase grows on top of this with θ≥1.0 ML coverage in agreement with LEED data. It was also observed that the (2×3) phase formation is critical to the Sr coverage and to the annealing temperature as well. The relationship between the (2×3) and (1×3) ordered structures has been investigated as a function of Sr coverage and annealing temperature.
Original language | English |
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Pages (from-to) | 1000-1004 |
Number of pages | 5 |
Journal | Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures |
Volume | 14 |
Issue number | 2 |
Publication status | Published - 1996 Mar 1 |
ASJC Scopus subject areas
- Condensed Matter Physics
- Electrical and Electronic Engineering