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Semiconductor device and manufacturing method thereof

  • US 8,501,555 B2
  • Filed: 09/10/2009
  • Issued: 08/06/2013
  • Est. Priority Date: 09/12/2008
  • Status: Active Grant
First Claim
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1. A method for manufacturing a semiconductor device comprising the steps of:

  • forming a gate electrode over an insulating surface;

    forming a gate insulating layer over the gate electrode;

    forming a source region, a drain region, a first metal layer over the source region and a second metal layer over the drain region;

    subjecting a top surface of the gate insulating layer which is exposed, a top surface of the first metal layer, and a top surface of the second metal layer, to a plasma treatment; and

    forming a non-single-crystal oxide semiconductor layer over the gate insulating layer without exposure to air after the subjecting the gate insulating layer to the plasma treatment,wherein the non-single-crystal oxide semiconductor layer overlaps with the gate electrode, andwherein an oxygen concentration in the source region and the drain region is lower than an oxygen concentration in the non-single-crystal oxide semiconductor layer.

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