Giorgia M. Lopez
University of Cagliari
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Publication
Featured researches published by Giorgia M. Lopez.
Applied Physics Letters | 2006
Giorgia M. Lopez; Vincenzo Fiorentini
Based on ab initio density-functional energetics for saturated (n=2m+2) fluorine-vacancy clusters FnVm for m up to 4, the authors set up a model showing that (a) fluorine-vacancy (F–V) aggregates in Si can form in any size and concentration for sufficient concentrations of incorporated (e.g., implanted) F, and (b) the F to V ratio in F–V complexes (i.e., the inverse capture efficiency of self-interstitials) is an ensemble average over many cluster sizes. It ranges between 4 and 2, with typical values of 2.2–2.5, consistent with recent experimental estimates.
Applied Physics Letters | 2004
Claudio Melis; Giorgia M. Lopez; Vincenzo Fiorentini
We study via first-principles calculations the energetics and diffusion of Ga in c-Si. In contrast to B and In, the favored Ga/self-interstitial complex is the tetrahedral interstitial GaT. Thus in the presence of self-interstitials Ga becomes interstitial, and is electrically deactivated as an acceptor. Studying the native-defect assisted diffusion, we find a self-interstitial-assisted mechanism to be favored; vacancy-assisted diffusion has a sizably larger activation energy, in agreement with the observed transient enhanced diffusion behavior.
Physical Review B | 2008
Alessio Filippetti; Giorgia M. Lopez; Mauro Mantega; Vincenzo Fiorentini
We describe from advanced first principles calculations the energetics of oxygen doping and its relation to insulator-metal transitions in underdoped YBa
Physical Review B | 2016
Zu-Jian Ying; Valentina Brosco; Giorgia M. Lopez; Daniele Varsano; Paola Gori-Giorgi; J. Lorenzana
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210th ECS Meeting | 2006
Vincenzo Fiorentini; Alessio Filippetti; Giorgia M. Lopez
Cu
Physical Review B | 2005
Giorgia M. Lopez; Vincenzo Fiorentini; G. Impellizzeri; S. Mirabella; E. Napolitani
_3
Physical Review B | 2004
Giorgia M. Lopez; Vincenzo Fiorentini
O
Physical Review B | 2010
Giorgia M. Lopez; Alessio Filippetti; Mauro Mantega; Vincenzo Fiorentini
_{6+x}
Physical Review Letters | 2006
Vincenzo Fiorentini; Giorgia M. Lopez
. We find a strong tendency of doping oxygens to order into non-magnetic Cu
Physical Review B | 2005
L. Romano; A.M. Piro; Maria Grazia Grimaldi; Giorgia M. Lopez; Vincenzo Fiorentini
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