STUDY OF ALKYL-BROMIDE MONOLAYERS ON HYDROGENTERMINATED SILICON (100) SURFACES

Abstract

The organic monolayers of saturated alkyl chains linked to silicon substrates are used for the development of devices with important electronic properties. In this study, thanks to the use of 10-bromine-1-decene and 11-bromine-1-undecene molecules on silicon surfaces, the formation of a system potentially applicable in the modification of the end groups of the carbon chain is achieved in the organic monolayers, that is to say the functionalization of the monolayer allowing a better charge transport through the molecules. The silicon surface (oxide-free) was passivated by hydrogenation. Respect to the formation of the organic monolayer, the hydrogen-terminated silicon surface was subjected to 200°C with each of the mentioned organic molecules. Both the hydrogenated surface and the organic monolayers were characterized by the measurement of the contact angle between water droplets and the surface, and atomic force microscopy. Finally, by means of molecular calculations at levels 3-21(G) on clusters of Si7H6, Si7H15C10H20Br and Si7H15C11H22Br, possible reactions of formation of the organic monolayers previously studied experimentally, are proposed.