Self-organisation of inorganic elements on Si(001) mediated by pre-adsorbed organic molecules

Abstract

A combined theoretical and experimental study on the adsorption of an isolated benzonitrile molecule on the Si(001) surface, followed by the adsorption of Al (group III), Pb (carbon group) and Ag (transition metal) is presented. It is shown that two new adsorption sites with enhanced reactivity are formed on the surface in the vicinity of the pre-adsorbed molecule. This is evidenced by the increase of the calculated binding energy of the metallic ad-atoms adsorbed at these sites. Experimentally, this enhanced local reactivity of the modified surface is only partially retained when more metallic atoms are adsorbed on the modified surface at room temperature. This is evidenced by the formation of 1-dimensional atomic chains (Pb, Al) attached to one side of the pre-adsorbed molecule.

Adsorption and Visualization of Solvated Na/Br Carbenoids on Ag(111)

“…Unsolvated Na/Br carbenoid was explored in two configurations: first, with the Na atom pointing to the surface (configuration A) and second, with the Br atom of carbenoid pointing to the surface (configuration B), see Figure . Compared to the large interaction of Na or Br atoms with metallic surfaces, we deemed other adsorption configurations unlikely because of the low interaction energy gain from the hydrogen atoms of phenyl rings pointing toward metal surfaces. , The differential charge map reveals a charge redistribution between the Na/Br carbenoid and the silver surface, see Figure c. Below the Na atom, there is an accumulation of charge, whereas the charge is reduced around the sulfur atoms.…”

Functionalization of the Si(1 1 1) 7 × 7 substrate with coronene molecules using simple molecular source

“…formation of the metallic contacts [3,4], monoatomic passivation layers [5][6][7][8] or thin insulating layers [9,10]. On the other hand, local surface defects or adsorbed molecules are considered for the controlled nanostructures growth [11][12][13]. The aromatic molecules deposited on the substrates are often used to grow graphene flakes and layers on metallic [14,15] and semiconductor substrates [16,17].…”

“…The ability to control the process of molecules deposition is a key issue for the surface functionalization and graphene layer growth [13,18,19]. Maintaining relevant properties of the substrate is * E-mail: marta.przychodnia@gmail.com possible by using ultrahigh vacuum (UHV) conditions which are necessary in generation of a pure molecular beam.…”