Effect of nitrogen surrounding gas and plasma assistance on nitrogen incorporation in a-C:N films by femtosecond pulsed laser deposition

Abstract : In the context of nitrogen-rich amorphous carbon thin films ultrafast pulsed laser deposition from graphite targets in inert nitrogen or nitrogen plasma ambient, this study assesses the correlation between the ablation plume composition and dynamics and the thin films contents and structures. The use of both optical emission spectroscopy and spectrally resolved 2D imaging, coupled with intensified CCD temporal resolution, allows to precisely follow such species of the plume as CN and C-2 molecules, from their apparition to their deposition on the substrate. The results show that carbon-nitrogen bonding arises at the early time of expansion with little changes in quantity thereafter. The key role of the DC-bias is in lowering the molecular weight of the ambient gas, thus easing molecules way toward the target and interfering with the chemical reaction for CN generation. Depending on the ambient pressure, these processes will have drastically different effects on the thin films properties and contents. This work thus explains the origin of high nitrogen contents in a-C:N thin films obtained using DC-bias, and proposes an easy in situ optical observation-based way to predict and look for the best conditions to maximize those contents in future work.
Type de document :
Article dans une revue
Applied Surface Science, Elsevier, 2016, 374, pp. 104-111 〈10.1016/j.apsusc.2015.10.039 〉
Liste complète des métadonnées

https://hal-emse.ccsd.cnrs.fr/emse-01495219
Contributeur : Géraldine Fournier-Moulin <>
Soumis le : vendredi 24 mars 2017 - 16:27:15
Dernière modification le : mercredi 7 février 2018 - 11:29:43

Identifiants

Collections

Citation

Florent Bourquard, Chiranjeevi Maddi, Christophe Donnet, A.-S. Loir, Vincent Barnier, et al.. Effect of nitrogen surrounding gas and plasma assistance on nitrogen incorporation in a-C:N films by femtosecond pulsed laser deposition . Applied Surface Science, Elsevier, 2016, 374, pp. 104-111 〈10.1016/j.apsusc.2015.10.039 〉. 〈emse-01495219〉

Partager

Métriques

Consultations de la notice

72