Invention Grant
US09240404B2 Embedded polysilicon resistor in integrated circuits formed by a replacement gate process 有权
通过替代栅极工艺形成的集成电路中的嵌入式多晶硅电阻

Embedded polysilicon resistor in integrated circuits formed by a replacement gate process
Abstract:
An embedded resistor structure in an integrated circuit that can be formed in a replacement gate high-k metal gate metal-oxide-semiconductor (MOS) technology process flow. The structure is formed by etching a trench into the substrate, either by removing a shallow trench isolation structure or by silicon etch at the desired location. Deposition of the dummy gate polysilicon layer fills the trench with polysilicon; the resistor polysilicon portion is protected from dummy gate polysilicon removal by a hard mask layer. The resistor polysilicon can be doped during source/drain implant, and can have its contact locations silicide-clad without degrading the metal gate electrode.
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