发明授权
US07557000B2 Etching method and structure using a hard mask for strained silicon MOS transistors
有权
用于应变硅MOS晶体管的硬掩模的蚀刻方法和结构
- 专利标题: Etching method and structure using a hard mask for strained silicon MOS transistors
- 专利标题(中): 用于应变硅MOS晶体管的硬掩模的蚀刻方法和结构
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申请号: US11609748申请日: 2006-12-12
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公开(公告)号: US07557000B2公开(公告)日: 2009-07-07
- 发明人: John Chen , Hanming Wu , Da Wei Gao , Bei Zhu , Paolo Bonfanti
- 申请人: John Chen , Hanming Wu , Da Wei Gao , Bei Zhu , Paolo Bonfanti
- 申请人地址: CN Shanghai
- 专利权人: Semiconductor Manufacturing International (Shanghai) Corporation
- 当前专利权人: Semiconductor Manufacturing International (Shanghai) Corporation
- 当前专利权人地址: CN Shanghai
- 代理机构: Townsend and Townsend and Crew LLP
- 优先权: CN200610118722 20061120
- 主分类号: H01L21/8238
- IPC分类号: H01L21/8238
摘要:
A method for forming an strained silicon integrated circuit device. The method includes providing a semiconductor substrate and forming a dielectric layer overlying the semiconductor substrate. The method also includes forming a gate layer overlying the dielectric layer and forming a hard mask overlying the gate layer. The method patterns the gate layer to form a gate structure including edges using the hard mask as a protective layer. The method forms a dielectric layer overlying the gate structure to protect the gate structure including the edges. The method forms spacers from the dielectric layer, while maintaining the hard mask overlying the gate structure. The method etches a source region and a drain region adjacent to the gate structure using the dielectric layer and the hard mask as a protective layer, while the hard mask prevents any portion of the gate structure from being exposed. In a preferred embodiment, the method maintains the hard mask overlying the gate structure. The method includes depositing silicon germanium material into the source region and the drain region to fill the etched source region and the etched drain region, while maintaining any portion of the gate layer from being exposed using the hard mask such that the gate structure is substantially free from any permanent deposition of silicon germanium material, which causes a channel region between the source region and the drain region to be strained in compressive mode from at least the silicon germanium material formed in the source region and the drain region. In a preferred embodiment, the method removing the hard mask from the gate structure to expose a top portion of the gate structure and maintains the top portion of the gate structure being substantially free from any silicon germanium material.
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