How to control solid state dewetting: A short review

Leroy, F.; Borowik, Łukasz; Cheynis, Fabien; Almadori, Y.; Curiotto, S.; Trautmann, M.; Barbé, Jean-Charles; Müller, Pierre

doi:10.1016/j.surfrep.2016.03.002

Cited by 173 publications

(134 citation statements)

References 142 publications

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“…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.…”

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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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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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“…Providing with higher thermal energy supply, more Cu atoms can be activated to escape from continuous thin films, leading to an increased amount of diffusing Cu adatoms within unit area ( N Cu ) based on the solid‐state dewetting theory . Thus, the diffusion flux of Cu adatoms ( J Cu ) can be given with

J_{Cu} = - \frac{D_{normalS} γ_{Cu} Ω N_{Cu}}{k T} \times \nabla κ

where ∇κ is the surface gradient of the Cu film curvature, γ Cu is surface energy of Cu, Ω is atomic volume, k is Boltzmann constant, and T is ambient temperature (annealing temperature). The diffusion coefficient ( D S ) can be given with

D_{normalS} = D_{0} e^{- γ_{Cu} / k T}

, where D 0 is ideal diffusion coefficient.…”

Section: Resultsmentioning

confidence: 99%

Ultrahigh Responsivity UV Photodetector Based on Cu Nanostructure/ZnO QD Hybrid Architectures

et al. 2019

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Strong near‐surface electromagnetic field formed by collective oscillation of electrons on Cu nanostructure a shows a strong dependence on geometry, offering a promising approach to boost the light absorption of ZnO photoactive layers with enhanced plasmon scattering. Here, a facile way to fabricate UV photodetectors with tunable configuration of the self‐assembled Cu nanostructures on ZnO thin films is reported. The incident lights are effectively confined in ZnO photoactive layers with the existence of the uplayer Cu nanostructures, and the interdiffusion of Cu atoms during fabrication of the Cu nanostructures can improve the carrier transfer in ZnO thin films. The optical properties of the hybrid architectures are successfully tailored over a control of the geometric evolution of the Cu nanostructures, resulting in significantly enhanced photocurrent and responsivity of 2.26 mA and 234 A W−1 under a UV light illumination of 0.62 mW cm−2 at 10 V, respectively. The photodetectors also exhibit excellent reproducibility, stability, and UV–visible rejection ratio (R370 nm/R500 nm) of ≈370, offering an approach of high‐performance UV photodetectors for practical applications.

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“…The former case may be triggered by defects in the substrate, while the latter case is characterized by the increased amplitude of capillary waves within the film. Solid metallic thin films are metastable depending on the choice of substrate and will often require additional energetic input before dewetting is observed [12]. This can involve raising the system temperature past the melting point of the metal; however, dewetting has also been observed in films while they were in the solid phase and at room temperature (~20 • C) [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Direct-Write Dewetting of High Melting Temperature Metals on Flexible Substrates

2019

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Microelectromechanical systems (MEMS) are pervasive in modern technology due to their reliability, small foot print, and versatility of function. While many of the manufacturing techniques for MEMS devices stem from integrated circuit (IC) manufacturing, the wide range of designs necessitates more varied processing techniques. Here, new details of a scanning laser based direct-write dewetting technique are presented as an expansion of previous demonstrations. For the first time, the ability to pattern a high melting temperature and high reflectance metallic thin films of Ni and Ag, respectively, on polymer substrates is reported. Novel methods for reducing the power necessary for processing highly reflective films are demonstrated by depositing very thin films of high near-infrared absorbance.

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How to control solid state dewetting: A short review

Cited by 173 publications

References 142 publications

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

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

Ultrahigh Responsivity UV Photodetector Based on Cu Nanostructure/ZnO QD Hybrid Architectures

Direct-Write Dewetting of High Melting Temperature Metals on Flexible Substrates

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