Modeling of silicon irradiation with C60 ions and the role of the interaction potential
- Authors: Karasev K.P.1,2, Strizhkin D.A.2, Titov A.I.2, Karaseov P.A.2
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Affiliations:
- Alferov University
- Peter the Great Saint-Petersburg Polytechnic university
- Issue: No 4 (2024)
- Pages: 68–74
- Section: Articles
- URL: https://journals.rcsi.science/1028-0960/article/view/261078
- DOI: https://doi.org/10.31857/S1028096024040099
- EDN: https://elibrary.ru/GITLCO
- ID: 261078
Cite item
Abstract
Molecular dynamic simulation was used to study the processes of impact of 2–14 keV C60 molecular ions on the Si(100) surface at temperatures of 0–1000 K. Tersoff–ZBL and Airebo interaction potentials were used and the electronic energy loss of fast particles was taken into account. It is shown that when simulating single impact events, the target temperature does not affect the development of the displacement cascade, but affects its thermalization and the formation of the crater on the surface. As the energy increases, the carbon penetration depth, the size of the formed crater and the rim increase. The sputtering coefficient of silicon atoms in this case increases linearly with energy, and in the case of carbon atoms it reaches a steady-state value at 10 keV. Using the Tersoff potential gives a larger number of atomized carbon atoms for single impact events compared to Airebo potential. During cumulative events, the formation of an etch pit is observed at the initial stage, followed by the carbon film growth. In contrast to single events, the use of the Airebo potential in the case of cumulative ion accumulation gives a higher sputtering coefficient than the Tersoff potential. The formation of carbide bonds in the crystal and an increase in their concentration with ion fluence slightly reduces the number of sputtered particles. Therefore, for correct comparison of simulation results with experiment, it is not enough to use the results of the analysis of single impact event. It is necessary to perform the simulation of the cumulative fluence accumulation.
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About the authors
K. P. Karasev
Alferov University; Peter the Great Saint-Petersburg Polytechnic university
Author for correspondence.
Email: kir.karasyov2017@yandex.ru
Russian Federation, 195251, Saint-Petersburg; 195251, Saint-Petersburg
D. A. Strizhkin
Peter the Great Saint-Petersburg Polytechnic university
Email: kir.karasyov2017@yandex.ru
Russian Federation, 195251, Saint-Petersburg
A. I. Titov
Peter the Great Saint-Petersburg Polytechnic university
Email: kir.karasyov2017@yandex.ru
Russian Federation, 195251, Saint-Petersburg
P. A. Karaseov
Peter the Great Saint-Petersburg Polytechnic university
Email: platon.karaseov@spbstu.ru
Russian Federation, 195251, Saint-Petersburg
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