Methods for manufacturing semiconductor devices
First Claim
1. A method for manufacturing a semiconductor device having two opposite types of MOSFETs formed on one semiconductor substrate, comprising:
- forming MOSFETs on the semiconductor substrate, said MOSFETs comprising source/drain regions located in the semiconductor substrate, a dummy gate stack located between the source/drain regions and above the semiconductor substrate and a gate spacer surrounding the dummy gate stack;
removing the dummy gate stack of said MOSFETs to expose the surface of the semiconductor substrate to form a gate opening;
forming an interfacial oxide layer on the exposed surface of the semiconductor structure;
forming a high-K gate dielectric on the interfacial oxide layer within the gate opening;
forming a first metal gate layer on the high-K gate dielectric;
implanting non-metal doping ions in the first metal gate layer, the two opposite types of MOSFETs comprise a N-type MOSFET and a P-type MOSFET, and the step of implanting doping ions into the first metal gate layer comprising;
the P-type MOSFET is shielded, and the ion implantation is performed by implanting a first dopant which is one selected from a group consisting of P and As on the first metal gate layer of the N-type MOSFET; and
the N-type MOSFET is shielded, and the ion implantation is performed by implanting a second dopant which is one selected from a group consisting of B and BF(2) on the first metal gate layer of the P-type MOSFET;
forming a second metal gate layer on the first metal gate layer to fill the gate opening; and
annealing at a temperature within a range between 350 degrees Centigrade and 450 degrees Centigrade to diffuse and accumulate the non-metal doping ions at an upper interface between the high-K gate dielectric and the first metal gate layer and at a lower interface between the high-K gate dielectric and the interfacial oxide, and generating an electric dipole at the lower interface between the high-K gate dielectric and the interfacial oxide by interfacial reaction.
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Abstract
There is disclosed a method for manufacturing a semiconductor device comprising two opposite types of MOSFETs formed on one semiconductor substrate, the method comprising: forming a portion of the MOSFET on the semiconductor substrate, said portion of said MOSFET comprising source/drains regions located in the semiconductor substrate, a dummy gate stack located between the source/drain region and above the semiconductor substrate and a gate spacer surrounding the dummy gate stack; removing the dummy gate stack of said MOSFET to form a gate opening which exposes the surface of the semiconductor substrate; forming an interfacial oxide layer on the exposed surface of the semiconductor structure; forming a high-K gate dielectric on the interfacial oxide layer within the gate opening; forming a first metal gate layer on the high-K gate dielectric; implanting doping ions in the first metal gate layer; forming a second metal gate layer on the first metal gate layer to fill up the gate opening; and annealing to diffuse and accumulate the doping ions at an upper interface between the high-K gate dielectric and the first metal gate layer and at a lower interface between the high-K gate dielectric and the interfacial oxide, and generating an electric dipole at the lower interface between the high-K gate dielectric and the interfacial oxide by interfacial reaction.
14 Citations
14 Claims
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1. A method for manufacturing a semiconductor device having two opposite types of MOSFETs formed on one semiconductor substrate, comprising:
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forming MOSFETs on the semiconductor substrate, said MOSFETs comprising source/drain regions located in the semiconductor substrate, a dummy gate stack located between the source/drain regions and above the semiconductor substrate and a gate spacer surrounding the dummy gate stack; removing the dummy gate stack of said MOSFETs to expose the surface of the semiconductor substrate to form a gate opening; forming an interfacial oxide layer on the exposed surface of the semiconductor structure; forming a high-K gate dielectric on the interfacial oxide layer within the gate opening; forming a first metal gate layer on the high-K gate dielectric; implanting non-metal doping ions in the first metal gate layer, the two opposite types of MOSFETs comprise a N-type MOSFET and a P-type MOSFET, and the step of implanting doping ions into the first metal gate layer comprising; the P-type MOSFET is shielded, and the ion implantation is performed by implanting a first dopant which is one selected from a group consisting of P and As on the first metal gate layer of the N-type MOSFET; and the N-type MOSFET is shielded, and the ion implantation is performed by implanting a second dopant which is one selected from a group consisting of B and BF(2) on the first metal gate layer of the P-type MOSFET; forming a second metal gate layer on the first metal gate layer to fill the gate opening; and annealing at a temperature within a range between 350 degrees Centigrade and 450 degrees Centigrade to diffuse and accumulate the non-metal doping ions at an upper interface between the high-K gate dielectric and the first metal gate layer and at a lower interface between the high-K gate dielectric and the interfacial oxide, and generating an electric dipole at the lower interface between the high-K gate dielectric and the interfacial oxide by interfacial reaction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification