Method for producing a gate
First Claim
1. A method for producing a gate on a semiconductor substrate wherein a first oxide layer, a conductive layer, a silicide layer, and a hard mask are formed on the semiconductor substrate, the method comprising:
- defining the hard mask to form a pattern of the gate;
performing an etching process to remove portions of the silicide layer and the conductive layer which are not covered by the hard mask so as to expose portions of the first oxide layer;
performing an O2 flush process to form a second oxide layer on the surface of the exposed first oxide layer; and
performing a wet etching process to remove a portion of the silicide layer to give sidewalls of the silicide layer a concave shape and to etch back the second oxide layer.
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Accused Products
Abstract
A method for producing a gate on a semiconductor substrate. The semiconductor substratehas a first oxide layer, a conductive layer, a silicide layer, and a hard mask formed thereon. The method includes defining the hard mask to form a pattern of the gate, performing an etching process to remove portions of the silicide layer and the conductive layer which are not covered by the hard mask, performing an O2 flush process to form a second oxide layer on the surface of the exposed first oxide layer, and performing a wet etching process to remove portions of the silicide layer to of give sidewalls of the silicide layer a concave shape and to etch back the second oxide layer.
21 Citations
11 Claims
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1. A method for producing a gate on a semiconductor substrate wherein a first oxide layer, a conductive layer, a silicide layer, and a hard mask are formed on the semiconductor substrate, the method comprising:
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defining the hard mask to form a pattern of the gate;
performing an etching process to remove portions of the silicide layer and the conductive layer which are not covered by the hard mask so as to expose portions of the first oxide layer;
performing an O2 flush process to form a second oxide layer on the surface of the exposed first oxide layer; and
performing a wet etching process to remove a portion of the silicide layer to give sidewalls of the silicide layer a concave shape and to etch back the second oxide layer. - View Dependent Claims (2, 3, 4)
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5. A method for producing a metal oxide semiconductor (MOS) transistor on a semiconductor substrate, the method comprising:
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forming a first oxide layer, a conductive layer, a silicide layer, and a hard mask sequentially;
defining the hard mask to form a gate pattern of the MOS transistor;
performing an etching process to remove portions of the silicide layer and the conductive layer which are not covered by the hard mask so as to expose portions of the first oxide layer;
performing an O2 flush process to form a second oxide layer on the surface of the exposed first oxide layer;
performing a wet etching process to remove a portion of the silicide layer to give sidewalls of the silicide layer a concave shape and to etch back the second oxide layer for forming the gate structure of the MOS transistor; and
performing an first ion implantation process to form a lightly doped drain (LDD) in the semiconductor substrate. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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Specification