Solid state dewetting and stress relaxation in a thin single crystalline Ni film on sapphire

Rabkin, Eugen; Amram, Dor; Alster, Eli

doi:10.1016/j.actamat.2014.04.020

Cited by 44 publications

(20 citation statements)

References 30 publications

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“…The remarkable stability of the interconnect might be related to the incident that none of the two adjacent islands is clearly energetically favored (similar size, no clear orientation, multiple grains, no pronounced faceting). An intrinsic stability of the thin connections can be related to faceting due to surface energy anisotropy, making them stable against perturbations [70][71][72]. Further investigations on the phenomenon of these thin and straight connections will have to be performed to elucidate their nature and the role they play in dewetting as paths for mass transport.…”

Section: General Observationsmentioning

confidence: 98%

The process of solid-state dewetting of Au thin films studied by in situ scanning transmission electron microscopy

et al. 2015

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Section: General Observationsmentioning

confidence: 98%

The process of solid-state dewetting of Au thin films studied by in situ scanning transmission electron microscopy

et al. 2015

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“…From one side, solid-state dewetting can be deleterious by fabricating the thin film structures, e.g., microelectronic and optoelectronic devices, thus destroying the reliability of the devices; on the other side, it is advantageous and can be positively used to produce the well-controlled formation of an array of micro-/nanoscale particles, e.g., used in sensors [37,2] and as catalysts for carbon [44] and semiconductor nanowire growth [46]. Recently, solid-state dewetting has attracted considerable interest, and has been widely studied by many experimental (e.g., [1,20,40,39,34,43,61]) and theoretical (e.g., [4,5,17,23,27,51,55,13,58,30,66]) research groups. The understanding of its equilibrium patterns and kinetic morphology evolution characteristics could provide important knowledge to develop new experimental methods in order to control solid-state dewetting [35], and enhance its potential applications in thin film technologies.…”

mentioning

confidence: 99%

Sharp-interface approach for simulating solid-state dewetting in two dimensions: A Cahn–Hoffman ξ-vector formulation

Jiang

Zhao

2019

Physica D: Nonlinear Phenomena

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The problem of simulating solid-state dewetting of thin films in three dimensions (3D) by using a sharp-interface approach is considered in this paper. Based on the thermodynamic variation, a speed method is used for calculating the first variation to the total surface energy functional. The speed method shares more advantages than the traditional use of parameterized curves (or surfaces), e.g., it is more intrinsic and its variational structure (related with Cahn-Hoffman ξ-vector) is clearer and more direct. By making use of the first variation, necessary conditions for the equilibrium shape of the solid-state dewetting problem is given, and a kinetic sharp-interface model which includes the surface energy anisotropy is also proposed. This sharp-interface model describes the interface evolution in 3D which occurs through surface diffusion and contact line migration. By solving the proposed model, we perform lots of numerical simulations to investigate the evolution of patterned films, e.g., the evolution of a short cuboid and pinch-off of a long cuboid. Numerical simulations in 3D demonstrate the accuracy and efficacy of the sharp-interface approach to capture many of the complexities observed in solid-state dewetting experiments.

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“…In a recent set of experiments, Ye and Thompson [4][5][6][7] demonstrated the geometric complexity and importance of crystalline anisotropy in dewetting. These, and related, recent experiments have led to renewed interest in understanding thin film dewetting and the influence of crystalline anisotropy on dewetting phenomena [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Sharp interface model for solid-state dewetting problems with weakly anisotropic surface energies

et al. 2015

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We propose a sharp interface model for simulating solid-state dewetting where the surface energy is (weakly) anisotropic. The morphology evolution of thin films is governed by surface diffusion and contact line migration. The mathematical model is based on an energy variational approach. Anisotropic surface energies lead to multiple solutions of the contact angle equation at contact points. Introduction of a finite contact point mobility is both physically based and leads to robust, unambiguous determination of the contact angles. We implement the mathematical model in an explicit finite difference scheme with cubic spline interpolation for evolving marker points. Following validation of the mathematical and numerical approaches, we simulate the evolution of thin film islands, semi-infinite films, and films with holes as a function of film dimensions, Young's angle θ i , anisotropy strength and crystal symmetry, and film crystal orientation relative to the substrate normal. We find that the contact point retraction rate can be well described by a power-law, l ∼ t n . Our results demonstrate that the exponent n is not universal -it is sensitive to the Young's angle θ i (and insensitive to anisotropy). In addition to classical wetting (where holes in a film heal)and dewetting (where holes in a film grow), we observe cases where a hole through the film heals but leave a finite size hole/bubble between the continuous film and substrate or where the hole heals leaving a continuous film that is not bonded to the substrate. Surface energy anisotropy (i) increases the instability that leads to island break-up into multiple islands, (ii) enhances hole healing, and (iii) leads to finite island size even under some conditions where the Young's angle θ i suggests that the film wets the substrate. The numerical results presented in the paper capture many of the complexities associated with solid-state dewetting experiments. * jiangwei1007@whu.edu.cn 2

show abstract

Solid state dewetting and stress relaxation in a thin single crystalline Ni film on sapphire

Cited by 44 publications

References 30 publications

The process of solid-state dewetting of Au thin films studied by in situ scanning transmission electron microscopy

The process of solid-state dewetting of Au thin films studied by in situ scanning transmission electron microscopy

Sharp-interface approach for simulating solid-state dewetting in two dimensions: A Cahn–Hoffman ξ-vector formulation

Sharp interface model for solid-state dewetting problems with weakly anisotropic surface energies

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