Plasma-enhanced chemical vapor deposition of a nucleation layer in a tungsten metallization process
US6451677B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 1999 |
| Grant date | Sep 17, 2002 |
| Priority date | — |
| Expiry date | Feb 23, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L21/76843
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
An embodiment of the instant invention is a method of fabricating an electronic device formed over a semiconductor substrate and having a conductive feature comprised of tungsten, the method comprising the steps of: forming a nucleation layer over the semiconductor substrate by introducing a combination of WF6, H2 and a plasma; and forming a tungsten layer on the nucleation layer by means of chemical vapor deposition. In an alternative embodiment, an insulating layer is formed on the substrate and situated between the nucleation layer and the substrate. Preferably, this embodiment additionally includes the step of forming a nitrogen-containing layer under the nucleation layer by introducing a combination of WF6, N2, H2, and a plasma. The conductive feature is, preferably, a conductive gate structure, and the insulating layer is, preferably, comprised of: an oxide, a nitride, an insulating material with a dielectric constant substantially higher than that of an oxide, and any combination thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.