Dresden 2003 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 43: Symposium Nitride
HL 43.1: Vortrag
Donnerstag, 27. März 2003, 14:30–15:00, POT/81
Tailoring materials properties by surface engineering — •Jörg Neugebauer1, Andreia Rosa1, Liverios Lymperakis1, Matthias Scheffler1, John Northrup2, and Randell Feenstra3 — 1Fritz-Haber-Institut, Faradayweg 4-6, D-14195 Berlin — 2PARC, Palo Alto, CA, USA — 3Carnegie Mellon Univ., Pittsburgh, PA, USA
A first step towards controlling and improving the quality of semiconductor devices is a better understanding of the fundamental mechanisms during growth. A challenge in identifying these mechanisms and there effect on materials quality is the large range of relevant length and time scales. In the present talk we will discuss how by combining density-functional theory with concepts of thermodynamics and/or statistical physics simulations can be performed which allow to bridge between microscopic and mesoscopic scales. Based on this approach we identify for the technologically important example of group-III nitrides how surfaces can be used to tailor materials properties. Examples which will be discussed concern the identification of suitable surfactants (to obtain smooth surfaces/interfaces), antisurfactants (to form quantum dot like structures), surface orientations (to realize chemically ordered alloys) or surface structures which allow to overcome bulk doping limits.