Competition Between Kinetics and Thermodynamics During the Growth of Faceted Crystal by Phase Field Modeling

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

Abstract

The faceting of a growing crystal is theoretically investigated by a continuum model including the incorporation kinetics of adatoms. This allows us for predictions beyond a simple Wulff analysis which typically refers to faceted morphologies in terms of the equilibrium crystal shape for crystals with an anisotropic surface-energy, or to steady-state kinetic shape when the crystals grow with orientation-dependent velocities. A phase-field approach is implemented in order to account simultaneously for these contributions in two- and three dimensions reproducing realistic kinetic pathways for the morphological evolution of crystal surfaces during growth. After a systematic characterization of the faceting determined by orientation-dependent incorporation times, several different crystal morphologies are found by tuning the relative weights of thermodynamic and kinetic driving forces. Applications to realistic systems are finally reported showing the versatility of the proposed approach and demonstrating the key role played by the incorporation dynamics in out-of-equilibrium growth processes.

Details

OriginalspracheEnglisch
Aufsatznummer1800518
Seitenumfang10
FachzeitschriftPhysica Status Solidi (B): Basic Research
Jahrgang256
Ausgabenummer7
PublikationsstatusVeröffentlicht - Juli 2019
Peer-Review-StatusJa

Externe IDs

Scopus 85059855966
ORCID /0000-0002-4217-0951/work/142237409

Schlagworte

Schlagwörter

  • crystal faceting, incorporation time, kinetics, phase-field, surface diffusion, VECTOR THERMODYNAMICS, ANISOTROPIC SURFACES, ANGLE DEPOSITION, EVOLUTION, EPITAXY, FILMS, FUNDAMENTALS, EQUILIBRIUM