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Dynamic degradation of metallic nanowire networks under electrical stress: a comparison between experiments and simulations
Nanoscale Advances ( IF 4.7 ) Pub Date : 2020-12-8 , DOI: 10.1039/d0na00895h
Nicolas Charvin 1 , Joao Resende 2 , Dorina T Papanastasiou 2 , David Muñoz-Rojas 2 , Carmen Jiménez 2 , Ali Nourdine 1 , Daniel Bellet 2 , Lionel Flandin 1
Affiliation  

Metallic nanowire networks represent a promising solution for a new generation of transparent and flexible devices, including touch screens, solar cells and transparent heaters. They, however, lack stability under thermal and electrical stresses, often leading to the degradation of nanowires, which results in the loss of electrical percolation paths. We propose a comprehensive description of the degradation mechanism in a metallic nanowire network subjected to electrical stress. The nanowire network degradation is ascribed, at a very local scale, to the hot-spot formation and the subsequent propagation of a spatially correlated disruptive crack. We compare the behaviour of actual networks under electrical and thermal stresses to dynamic simulations of randomly deposited sticks on a 2D surface, and a thermal phenomenon simulated in a metal thin film. On one hand, such comparison allows us to deduce an average junction resistance between nanowires. On the other hand, we observed that initial flaws in a discrete network result in a local current density increase in the surrounding area, further leading to an amplified Joule effect. This phenomenon promotes the spatial correlation in the damage of the percolating network. Such non-reversible failure of the transparent electrode is in good agreement with experimental observations.

中文翻译:

金属纳米线网络在电应力下的动态退化:实验与模拟的比较

金属纳米线网络代表了新一代透明和柔性设备的有前途的解决方案,包括触摸屏、太阳能电池和透明加热器。然而,它们在热应力和电应力下缺乏稳定性,通常会导致纳米线退化,从而导致电渗流路径的损失。我们提出了对受到电应力的金属纳米线网络中降解机制的全面描述。在非常局部的尺度上,纳米线网络的退化归因于热点的形成和空间相关破坏性裂纹的随后传播。我们将实际网络在电应力和热应力下的行为与二维表面上随机沉积的棒的动态模拟进行比较,以及在金属薄膜中模拟的热现象。一方面,这种比较使我们能够推断出纳米线之间的平均结电阻。另一方面,我们观察到离散网络中的初始缺陷导致周围区域的局部电流密度增加,进一步导致焦耳效应放大。这种现象促进了渗流网络破坏的空间相关性。透明电极的这种不可逆失效与实验观察非常吻合。这种现象促进了渗流网络破坏的空间相关性。透明电极的这种不可逆失效与实验观察非常吻合。这种现象促进了渗流网络破坏的空间相关性。透明电极的这种不可逆失效与实验观察非常吻合。
更新日期:2021-01-04
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