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Method for fabricating semiconductor device

  • US 6,180,472 B1
  • Filed: 07/27/1999
  • Issued: 01/30/2001
  • Est. Priority Date: 07/28/1998
  • Status: Expired due to Term
First Claim
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1. A method for fabricating a semiconductor device, comprising the steps of:

  • a) forming a gate insulating film, a gate electrode and an on-gate protective layer in this order on a semiconductor substrate;

    b) implanting dopant ions into the semiconductor substrate using the gate electrode and the on-gate protective layer as a mask, thereby forming lightly-doped regions in the semiconductor substrate;

    c) depositing a first insulating film and a masking film in this order over the substrate, the masking film being able to be etched selectively with respect to the first insulating film;

    d) anisotropically etching the first insulating film and the masking film such that a first sidewall is formed on respective sides of the gate electrode and the on-gate protective layer by partially leaving the first insulating film thereon and that a second sidewall is formed on the first sidewall by partially leaving the masking film thereon;

    e) implanting dopant ions into the semiconductor substrate using the on-gate protective layer, the gate electrode and the first and second sidewalls as a mask, thereby forming heavily-doped regions in the semiconductor substrate;

    f) selectively removing the second sidewall so as to leave the first sidewall after the step e) has been performed;

    g) depositing a second insulating film over the substrate so as cover at least the on-gate protective layer and the first sidewall after the step f) has been performed;

    h) depositing an interlevel dielectric film over the substrate after the step g) has been performed, the interlevel dielectric film being made of a material that is able to be etched selectively with respect to the second insulating film;

    i) etching the interlevel dielectric film to form therein openings reaching the heavily-doped regions; and

    j) filling the openings in with plug electrodes made of a conductive material.

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