Metal hard mask method and structure for strained silicon MOS transistors
US7709336B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2005 |
| Grant date | May 4, 2010 |
| Priority date | — |
| Expiry date | Jun 28, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D62/822
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
A semiconductor integrated circuit device. The device has a semiconductor substrate and a dielectric layer overlying the semiconductor substrate. The device also has a gate structure including edges. A metal hard mask layer is overlying the gate structure. A dielectric layer is formed sidewall spacers on the edges of the gate structure to protect the gate structure including the edges. An exposed portion of the metal hard mask layer is overlying the gate structure. A silicon germanium fill material is provided in an etched source region and an etched drain region. The etched source region and the etched drain region are each coupled to the gate structure. The device has a strained channel region between the filled source region and the filled drain region from at least the silicon germanium material formed in the etched source region and the etched drain region. An electrical connection is coupled to the metal hard mask overlying the gate structure. Optionally, the device has a second metal layer overlying the metal hard mask.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.