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Role of carbon in the formation of hard Ge1−x C x thin films by reactive magnetron sputtering
- Source :
-
Physica B . Jul2011, Vol. 406 Issue 13, p2658-2662. 5p. - Publication Year :
- 2011
-
Abstract
- Abstract: We have deposited germanium carbide (Ge1−x C x ) films on Si(100) substrate via radio-frequency (RF) reactive magnetron sputtering in a CH4/Ar mixture discharge, and explored the effects of carbon content (x) on the chemical bonding and hardness for the obtained films. We find that x significantly influences the chemical bonding, which leads to a pronounced change in the hardness of the film. To reveal the relationship between the chemical bonding and hardness, first-principles calculations have been carried out. It is shown that as x increases from 0 to 0.33, the fraction of sp3 C–Ge bonds in the film increases at the expense of Ge–Ge bonds, which promotes formation of a strong covalently bonded network, and thus enhances the hardness of the film. However, as x further increases from 0.33 to 0.59, the fraction of sp3 C–Ge bonds in the film gradually reduces, while that of sp3 C–H and graphite-like sp2 C–C bonds increases, which damages the compact network structure, resulting in a sharp decrease in the hardness. This investigation suggests that the medium x (0.17<x<0.40) is most favorable to the preparation of hard Ge1−x C x films due to the formation of dominant sp3 C–Ge bonds. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 09214526
- Volume :
- 406
- Issue :
- 13
- Database :
- Academic Search Index
- Journal :
- Physica B
- Publication Type :
- Academic Journal
- Accession number :
- 60924596
- Full Text :
- https://doi.org/10.1016/j.physb.2011.01.077