FET DEVICE WITH REDUCED OVERLAP CAPACITANCE AND METHOD OF MANUFACTURE

    公开(公告)号:CA1049157A

    公开(公告)日:1979-02-20

    申请号:CA254958

    申请日:1976-06-16

    Applicant: IBM

    Inventor: ESCH RONALD P

    Abstract: FET DEVICE WITH REDUCED OVERLAP CAPACITANCE AND METHOD OF MANUFACTURE A metal gate transistor is fabricated to have reduced gate overlap of source/drain regions and increased oxide thickness over the diffused regions whereby parasitic capacitance is reduced and switching speed is increased. The method comprises the steps of (1) selecting an appropriate insulating thickness over a semiconductor substrate, (2) forming source/drain diffused regions in the substrate through openings in the insulating layer at appropriate diffusion temperatures, (3) selecting an appropriate drivein and regrowth temperature whereby the insulating layer thickness over the diffused region is greater than that over the non-diffused region and out diffusion of the diffused regions is minimized, (4) etching the region between the source/drain to form a gate area and (5) growing a prescribed gate insulation thickness for a metal gate whereby the gate insulation overlap of the diffused region and the thickness of the gate insulation overlap of the diffused region reduce the parasitic capacitance and increase the switching speed of the resulting metal gate transistor relative to prior art transistors.

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