When finite-size effects dictate the growth dynamics on strained freestanding nanomembranes - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Nanoscale Advances Année : 2020

When finite-size effects dictate the growth dynamics on strained freestanding nanomembranes

Résumé

We investigate the influence of strain-sharing and finite-size effects on the morphological instability of hetero-epitaxial nanomembranes made of a thin film on a thin freestanding substrate. We show that long-range elastic interactions enforce a strong dependence of the surface dynamics on geometry. The instability time-scale tau is found to diverge as (e/H)(-alpha) with alpha = 4 (respectively 8) in thin (resp. thick) membranes, where e (resp. H) is the substrate (resp. nanomembrane) thickness, revealing a huge inhibition of the dynamics as strain sharing decreases the level of strain on the surface. Conversely, tau vanishes as H-2 in thin nano-membranes, revealing a counter-intuitive strong acceleration of the instability in thin nanomembranes. Similarly, the instability length-scale displays a power-law dependence as (e/H)(-beta), with beta = alpha/4 in both the thin and thick membrane limits. These results pave the way not only for experimental investigation, but also, for the dynamical control of the inescapable morphological evolution in epitaxial systems.
Fichier principal
Vignette du fichier
2020-MezaOuah-NanoscAdv.pdf (1.61 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03970667 , version 1 (21-03-2023)

Identifiants

Citer

Mourad Mezaguer, Nedjma Ouahioune, Jean-Noël Aqua. When finite-size effects dictate the growth dynamics on strained freestanding nanomembranes. Nanoscale Advances, 2020, 2 (3), pp.1161-1167. ⟨10.1039/c9na00741e⟩. ⟨hal-03970667⟩
8 Consultations
3 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More