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Momentum transfer parameter in argon-assisted carbon coatings

TitoloMomentum transfer parameter in argon-assisted carbon coatings
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2001
AutoriRizzo, Antonella, Alvisi Marco, Sarto F., and Scaglione S.
RivistaThin Solid Films
Volume384
Paginazione215-222
ISSN00406090
Parole chiaveAmorphous films, Argon, Diamond Like Carbon Films, Dual ion beam sputtering, Film growth, Graphite, hardness, Ion beams, Ion bombardment, Momentum transfer parameter, Nucleation, Optical films, Sputter deposition, Thin films, Transparency
Abstract

It is well known that energetic particle bombardment during diamond-like carbon film growth has a significant influence on the resulting film stress, optical transparency, hardness and chemical inertness. It has been commonly recognized that many of the desirable properties of carbon films arise from the sp3 tetragonal bonding component. Therefore, it is essential to have a deeper knowledge of the role of ion energy on the evolution of the diamond-like phase. In this work, we propose a parameter (P) as a key for the understanding of the nucleation and growth mechanism, which takes into account the number of recoiled atoms and their transfer momentum by argon ion assistance, compared to all atoms present in the volume, described by ion range, plus the atoms coming from the graphite-sputtered target. Thin films of a-carbon were deposited by the dual ion beam sputtering technique. An argon ion beam sputters a graphite target and a second one assists the film during the growth. Sets of samples were produced with different momentum transferred by the assistance beam (P). A spectrophotometric analysis in the visible range is performed to determine the Tauc optical gap Eg, the refractive index and the extinction coefficient. The results show that the films not assisted exhibit a lower density and consequently a low refractive index (n = 1.8 in the visible range), while increasing the momentum transfer parameter (P) the refractive index increases suggesting a densification of the material. The same trend is observed for the Tauc optical gap. In order to get further information on the evaluation of density due to the assistance, X-ray reflectivity measurements have been performed and correlated to the optical results.

Note

cited By 5

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-0034823505&doi=10.1016%2fS0040-6090%2800%2901831-9&partnerID=40&md5=956dd3f3502d1fbd4d2e92dff42e37be
DOI10.1016/S0040-6090(00)01831-9
Citation KeyRizzo2001215