Interface collisions with diffusive mass transport

Marguet, Bastien; Reis, F. D. A. Aarão; Pierre-Louis, Olivier

doi:10.1103/physreve.106.014802

Cited by 2 publications

(1 citation statement)

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“…In most cases, W attains a maximal value near the average collision time (the only exception is the case with the lowest flux, in which W seems to saturate after the initial increase). That result parallels the previous observation of a decrease of the roughness during the collision of interfaces propagating with constant velocities, independently of their short range interactions [44]; see also [45]. The smoothening or roughening processes that take place after the formation of the GB depend on the flux.…”

Section: Morphological Evolutionsupporting

confidence: 90%

Formation of smoother grain boundaries in 2D materials using high deposition rates during the last stages of growth

Reis¹,

Marguet²,

Pierre-Louis³

2022

2D Mater.

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Grain boundary roughness can affect electronic and mechanical properties of two-dimensional materials. This roughness depends crucially on the growth process by which the two-dimensional material is formed. To investigate the key mechanisms that govern the roughness, we have performed kinetic Monte Carlo simulations of a simple model that includes particle attachment, detachment, and diffusion. We have studied the closure of the gap between two flakes during growth, and the subsequent formation of the grain boundary (GB) for a broad range of model parameters. The well known near-equilibrium (attachment-limited) and unstable (diffusion-limited) growth regimes are identified, but we also observe a third regime when the precursor flux is sufficiently high to saturate the gap between the edges with diffusing species. This high deposition rate regime forms GBs with spatially uncorrelated roughness, which quickly relax to smoother configurations. Extrapolating the numerical results (with support from a theoretical approach) to edge lengths and gap widths of some micrometers, we confirm the advantage of this regime to produce GBs with minimal roughness faster than near-equilibrium conditions. This suggests an unexpected route towards efficient growth of two-dimensional materials with smooth GBs.

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Section: Morphological Evolutionsupporting

confidence: 90%