Invention Application
- Patent Title: Method of forming trench contacts for MOS transistors
- Patent Title (中): 形成MOS晶体管的沟槽接触的方法
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Application No.: US11384143Application Date: 2006-03-17
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Publication No.: US20070218685A1Publication Date: 2007-09-20
- Inventor: Swaminathan Sivakumar , Charles Wallace , Alison Davis , Nadia Rahhal-Orabi
- Applicant: Swaminathan Sivakumar , Charles Wallace , Alison Davis , Nadia Rahhal-Orabi
- Main IPC: H01L21/44
- IPC: H01L21/44

Abstract:
A method to form transistor contacts begins with providing a transistor that includes a gate stack and first and second diffusion regions formed on a substrate, and a dielectric layer formed atop the gate stack and the diffusion regions. A first photolithography process forms first and second diffusion trench openings for the first and second diffusion regions. A sacrificial layer is then deposited into the first and second diffusion trench openings. Next, a second photolithography process forms a gate stack trench opening for the gate stack and a local interconnect trench opening coupling the gate stack trench opening to the first diffusion trench opening. The second photolithography process is carried out independent of the first photolithography process. The sacrificial layer is then removed and a metallization process is carried out to fill the first and second diffusion trench openings, the gate stack trench opening, and the local interconnect trench opening with a metal layer.
Information query
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