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Lecture

WEB Phase-field modeling of complex solid-state dewetting scenarios

Friday (25.09.2020)
10:40 - 10:55 M: Modelling and Simulation 1
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Solid-state dewetting is a process through which continuous solid films break and agglomerate to form separated islands. It is a spontaneous phenomenon mainly driven by surface energy minimization, which can occur in thin films via surface diffusion at high temperatures. Although being detrimental during the processing of planar architectures, it may be exploited to obtain a large variety of self-assembled structures in a controlled fashion, such as droplets, nanowires, connected filaments, and pierced films. This presentation outlines the continuum, phase-field modeling of surface diffusion applied to the study of solid-state dewetting. In particular, the case of monocrystalline films undergoing dewetting on amorphous substrates is addressed, including relevant physical contributions such as surface-energy anisotropy, elasticity effects and contact angles. The standard approach is discussed, along with recent model improvements. Numerical simulations are shown to reproduce and predict the outcome of several annealing experiments for patterned silicon-on-insulator films leading to complex nano-architectures [1] and ultra-long nanowires [2]. Moreover, they assess the role of elasticity in enabling a spinodal solid-state dewetting regime during the annealing of strained thin-crystalline films lying on amorphous substrates [3].


[1] M. Naffouti, et al., Science Advances 3, eaao1472 (2017)

[2] M. Bollani et al., Nature Communication 10, 5632 (2019)

[3] M. Salvalaglio et al., arXiv:1912.02952

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