Mechanisms of porous dielectric film modification induced by reducing and oxidizing ash plasmas in high-density plasmas - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics Année : 2007

Mechanisms of porous dielectric film modification induced by reducing and oxidizing ash plasmas in high-density plasmas

Résumé

This work focuses on the impact of oxidizing and reducing ash chemistries on the modifications of two porous SiOCH films with varied porosities (8% [low porosity (lp)-SiOCH] and 45% [high porosity (hp)-SiOCH]. The ash processes have been performed on SiOCH blanket wafers in either reactive ion etching (RIE) or downstream (DS) reactors. The modifications of the remaining film after plasma exposures have been investigated using different analysis techniques such as x-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy (FTIR), x-ray reflectometry, mercury probe capacitance measurement (C-V), and spectroscopic ellipsometry (SE). FTIR analyses show that the lp-SiOCH film is not significantly altered by any of the ash processes investigated (DS-H2/He, RIE-O2, and RIE-NH3, except by downstream oxidizing plasmas (DS-O2 or DS-N2 /O2 which induce some carbon depletion and moisture uptake, resulting in a slight increase of the k value. The porosity amplifies the sensitivity of the material to plasma treatments. Indeed, hp-SiOCH is fully modified (moisture uptake and carbon depletion) under oxidizing downstream plasma exposures (DS-O2 and DS-N2 /O2), while it is partially altered with the formation of a denser and modified layer (40– 60 nm thick), which is carbon depleted, hydrophilic, and composed of SiOxNyHz with RIE-NH3 and DS-N2 /H2 plasmas and SiOxHy with RIE-O2 plasma. In all the cases, the k value increase is mainly attributed to the moisture uptake rather than methyl group consumption. hp-SiOCH material is not altered using reducing DS chemistries (H2 /He and H2 /Ar). The porous SiOCH film degradation is presented and discussed with respect to chemistry, plasma parameters, and plasma mode in terms of film modification mechanism.
Fichier principal
Vignette du fichier
Posseme-JVSTB2007.pdf (780.75 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-00397094 , version 1 (12-01-2024)

Identifiants

Citer

N. Posseme, T. Chevolleau, T. David, Maxime Darnon, O. Louveau, et al.. Mechanisms of porous dielectric film modification induced by reducing and oxidizing ash plasmas in high-density plasmas. Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics, 2007, 25 (6), pp.1928-1940. ⟨10.1116/1.2804615⟩. ⟨hal-00397094⟩
56 Consultations
14 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More