Molecular dynamics simulation of atomic hydrogen diffusion in strained amorphous silica

doi:10.1088/1674-1056/ab5fc5

Abstract Understanding hydrogen diffusion in amorphous SiO₂ (a-SiO₂), especially under strain, is of prominent importance for improving the reliability of semiconducting devices, such as metal-oxide-semiconductor field effect transistors. In this work, the diffusion of hydrogen atom in a-SiO₂ under strain is simulated by using molecular dynamics (MD) with the ReaxFF force field. A defect-free a-SiO₂ atomic model, of which the local structure parameters accord well with the experimental results, is established. Strain is applied by using the uniaxial tensile method, and the values of maximum strain, ultimate strength, and Young's modulus of the a-SiO₂ model under different tensile rates are calculated. The diffusion of hydrogen atom is simulated by MD with the ReaxFF, and its pathway is identified to be a series of hops among local energy minima. Moreover, the calculated diffusivity and activation energy show their dependence on strain. The diffusivity is substantially enhanced by the tensile strain at a low temperature (below 500 K), but reduced at a high temperature (above 500 K). The activation energy decreases as strain increases. Our research shows that the tensile strain can have an influence on hydrogen transportation in a-SiO₂, which may be utilized to improve the reliability of semiconducting devices.

Keywords: molecular dynamics tensile strain amorphous SiO₂ hydrogen diffusion

Received: 04 November 2019
Revised: 04 December 2019
Accepted manuscript online:

PACS:	71.15.Pd	(Molecular dynamics calculations (Car-Parrinello) and other numerical simulations)
	71.20.-b	(Electron density of states and band structure of crystalline solids)
	66.30.-h	(Diffusion in solids)
	61.72.Hh	(Indirect evidence of dislocations and other defects (resistivity, slip, creep, strains, internal friction, EPR, NMR, etc.))

Fund: Project supported by the Science Challenge Project, China (Grant No. TZ2016003-1-105) and the CAEP Microsystem and THz Science and Technology Foundation, China (Grant No. CAEPMT201501).

Corresponding Authors: Xu Zuo
E-mail: xzuo@nankai.edu.cn

Cite this article:

Fu-Jie Zhang(张福杰), Bao-Hua Zhou(周保花), Xiao Liu(刘笑), Yu Song(宋宇), Xu Zuo(左旭) Molecular dynamics simulation of atomic hydrogen diffusion in strained amorphous silica 2020 Chin. Phys. B 29 027101

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Molecular dynamics simulation of atomic hydrogen diffusion in strained amorphous silica

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