Semiconductor device with metal gate and high-k tantalum oxide or tantalum oxynitride gate dielectric
US7060571B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 2004 |
| Grant date | Jun 13, 2006 |
| Priority date | — |
| Expiry date | Jul 10, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D64/691
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
Microminiaturized semiconductor devices are fabricated with a replacement metal gate and a high-k tantalum oxide or tantalum oxynitride gate dielectric with significantly reduced carbon. Embodiments include forming an opening in a dielectric layer by removing a removable gate, depositing a thin tantalum film, as by PVD at a thickness of 25 Å to 60 Å lining the opening, and then conducting thermal oxidation, as at a temperature of 100° C. to 500° C., in flowing oxygen or ozone to form a high-k tantalum oxide gate dielectric layer, or in oxygen and N2O or ozone and N2O ammonia to form a high-k tantalum oxynitride gate dielectric. Alternatively, oxidation can be conducted in an oxygen or ozone plasma to form the high-k tantalum oxide layer, or in a plasma containing N2O and oxygen or ozone to form the high-k tantalum oxynitride gate dielectric layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.