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Computer simulation of iridium sulphamate aquacomplexes composition and mechanisms of metal deposition on GaAS

Serge A. Beznosyuk* and Larisa V. Fomina

Physical and Colloidal Chemistry Department of Altai State University,
City, State, etc., Postal code

This is an abstract for a presentation given at the
11th Foresight Conference on Molecular Nanotechnology

 

The theoretical and experimental examinations of microscopic metal-semiconductor contacts show that their electrophysical parameters depend on properties of intermediate nano- layers situated between metal and semiconductor. Depending on processing environment of the semiconductor surface and drawing of metal of a various composition intermediate nano-layers are formed. At manufacturing fissile structures closing stages of processing - etching and wash - the surfaces of the semiconductor are determining in formation of a film of surface compounds, which is included in interlayer of created metal - semiconductor structures and essentially influences their physicochemical properties. Quantum chemistry simulation of iridium sulphamate aquacomplexes composition and mechanisms of their activation in electrochemistry processes of metal deposition on surface of gallium arsenide are taken under consideration. The model is under construction on initial gross formula of bi-nuclear iridium complexes and the coordination theory of complexes. Proposed compositions of two iridium sulphamate supracomlexes allow to account for solution coloration and increasing of metal yield on current in electrochemistry processes of metal deposition on surface of gallium arsenide by using of electrolyte cathodic treatment. Assumption of that main limitative stage is a process of heavy bi-nuclear iridium complexes jump diffusion between neighboring cages inside quasi-crystallized aqua-molecular environment permits to obtain estimation for average thermal relaxation time of any iridium supracomplex coherent quantum excitations within cages: t ~ 2,5×10-8 . It means that radio-frequency oscillations with n > 1/t ~ 40 MHz are able to generate coherent effects of iridium supracomplex motion within diffusion cages of electrolyte. Resonant absorption of RF-field within diffusion cages is conditioned by rotational quantum transitions of iridium supracomplexes. It is shown that diffusion coefficients D must have two maximum peaks on frequencies 160 MHz and 190 MHz. It reveals observable peaks of iridium yield on current influenced upon RF-field on frequencies 140 MHz and 190 MHz.


*Corresponding Address:
Serge A. Beznosyuk
Physical and Colloidal Chemistry Department of Altai State University
61, Lenin Avenue
Barnaul, Altai 656099 Russia
Phone: +7-3852-363537 Fax: +7-3852-667626
Email: beznosyuk@chemwood.dcn-asu.ru
Web: http://cde.dcn-asu.ru



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