Disputas: Svetlana Nikolaysen

Prøveforelesning

Bedømmelseskomité

Dr. Viktor Belko, Belarussian State University
Professor Arne Nylandsted Larsen, Universitetet i Aarhus
Førsteamanuensis Anette Gunnæs, Universitetet i Oslo

Leder av disputas:  Prof. Bengt Gunnar Svensson

Veileder:  Dr. Maria G. Ganchenkova, Prof. Terje G.Finstad

Sammendrag

Multiscale modeling of vacancy-related defects in stress-free and strained Si and Si_1-xGe_x heterostructures

The development of new silicon technologies for nanoelectronics and microsystems increases the interest in point defects and new properties of already known defects are currently being addressed experimentally and theoretically by different research groups. For example, the progress of the strained silicon technology and the development of silicon micro electromechanical systems (MEMS) working in high-load conditions put forward the question of silicon property modification by elastic strains.

A reliable control of microelectronic device material performance is only possible with a detailed knowledge of the properties of defects it contains. Thus the research of defects in silicon is an important and increasingly active field of microelectronic materials science. The broad spectrum of applied experimental approaches is extensively supplemented with numerical experiments using various atomistic computational methods. Yet, the understanding of defect properties and the mechanisms of defect-mediated processes are still very incomplete.

In this thesis a multiscale approach combining first-principles quantum-mechanical and kinetic Monte-Carlo methods is applied to a systematic study of the properties of p vacancy-type defects as well as vacancy-mediated microstructure evolution in relaxed and strained Si and Si/Si1-xGex heterostructures. A number of new original results is obtained and discussed in this thesis and which are important for the understanding of experimental results obtained by others.

The work has been done in Vestfold University College (Høgskolen i Vestfold) and University of Oslo. The research involved international collaboration with Helsinki University of Technology, Finland and RRC Kurchatov Institute, Russia. The principal results presented in the thesis have been published in 5 papers and presented at a number of international conferences.

Kontaktperson

For mer informasjon, kontakt Lars Bernhardsen.