Structural and electronic properties of the quasi-one-dimensional metallic chains of the Au-induced facets on the Si(5 5 12) surface

Formation of Sb submonolayer phases on high index Si(5512) surface

“…The high index Si(5 5 12)-(2 · 1) reconstructed surface [4] is an exceptionally interesting surface consisting of primary rows that divide the large unit cell (0.77 nm · 5.35 nm) into row like trenches of Si(3 3 7) and Si(2 2 5) subunits along the ð1 1 0Þ direction. Despite the controversies over the structure of Si (5 5 12) it is generally agreed, that this unit cell has two types of (3 3 7) subunits [4][5][6][7][8][9][10]. These (3 3 7) and (2 2 5) faceted trenches of different widths and electron densities form ideal templates to form 1-D nanostructures with large aspect ratios [11][12][13].…”

“…The corresponding line scan in Fig. 3(a) shows that the spacing between two successive spots along the ð6 6 5Þ direction is 1.174 nm À1 which corresponds to 5.35 nm in real space [10], and along ð1 1 0Þ direction is 8.18 nm À1 which corresponds to 0.77 nm, thus manifesting the large unit cell of 0.77 nm · 5.35 nm of the clean (2 · 1) reconstructed Si(5 5 12) surface. Fig.…”

“…Due to the unusual row like features, this high index surface has attracted several researchers not only to form metal nanowires of Au, Ag, Bi etc. [10,[14][15][16] but also to probe the role of kinetics in the resulting superstructural phase formation.…”

“…The sample temperature is monitored by a W-Re (5%, 25%) thermocouple mounted behind the sample, which is also calibrated with the help of an optical pyrometer. The atomic cleanliness of the sample was ascertained by the absence of carbon or other contamination on the surface by AES, and the observation of the characteristic sharp spots of the (2 · 1) reconstruction [10] in the LEED pattern of the Si(5 5 12). Antimony deposition was made from a home made tantalum-Knudsen cell, whose flux rate was controlled by regulating the current to the cell, and is measured in terms of the adsorbed monolayers [4].…”

Formation of Potassium Nanostructures on Reconstructed High Index Si (5512)2x1 Surface for Night Vision Devices (NVD)

“…It is reconstructed to a planner surface having a single domain with 1-D symmetry and relatively largest unit cell (5.35nm) [2]. Many studies have been already reported of the metal adsorption (Ag, Au, Cu, Bi and In) on high index Si (5512) surfaces and form the one dimensional nanostructure with large aspect ratio and study of various growth modes and formation of super-structures on Si (5512) surface [3][4][5][6][7][8][9]. Extensive studies of various metals like Sb, In, Ga, and Na, nanostructures on low and high index Si have already been carried out [10].…”