Semiconductor device having ferroelectric film as gate insulating film and manufacturing method thereof
First Claim
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1. A semiconductor device comprising:
- a gate insulating film which includes at least a first insulating film formed on the main surface of a semiconductor substrate and a first ferroelectric film formed on the first insulating film, containing a compound of a preset metal element and a constituent element of the first insulating film as a main component and having a dielectric constant larger than that of the first insulating film, a gate electrode formed on the gate insulating film and formed of one of Cu and a material containing Cu as a main component, and source and drain regions separately formed in the semiconductor substrate to sandwich the gate electrode.
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Abstract
A semiconductor device includes a gate insulating film which at least includes a first insulating film formed on the main surface of a semiconductor substrate and a first ferroelectric film formed on the first insulating film, containing a compound of a preset metal element and a constituent element of the first insulating film as a main component and having a dielectric constant larger than that of the first insulating film, a gate electrode formed on the gate insulating film and containing one of Cu and a material containing Cu as a main component, and source and drain regions separately formed in the semiconductor substrate to sandwich the gate electrode.
45 Citations
17 Claims
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1. A semiconductor device comprising:
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a gate insulating film which includes at least a first insulating film formed on the main surface of a semiconductor substrate and a first ferroelectric film formed on the first insulating film, containing a compound of a preset metal element and a constituent element of the first insulating film as a main component and having a dielectric constant larger than that of the first insulating film, a gate electrode formed on the gate insulating film and formed of one of Cu and a material containing Cu as a main component, and source and drain regions separately formed in the semiconductor substrate to sandwich the gate electrode. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A semiconductor device comprising:
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a gate insulating film which at least includes a first insulating film formed on the main surface of a semiconductor substrate and a first ferroelectric film formed on the first insulating film, containing a compound of a preset metal element and a constituent element of the first insulating film as a main component and having a dielectric constant larger than that of the first insulating film, a floating electrode formed on the gate insulating film and formed of one of Cu and a material containing Cu as a main component, source and drain regions separately formed in the semiconductor substrate to sandwich the floating electrode, a gate-gate insulating film which at least includes a second insulating film formed on the floating electrode and a second ferroelectric film formed on the second insulating film, containing a compound of a preset metal element and a constituent element of the second insulating film as a main component and having a dielectric constant larger than that of the second insulating film, and a control electrode formed on the gate-gate insulating film and formed of one of Cu and a material containing Cu as a main component. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method of manufacturing a semiconductor device comprising:
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forming a first insulating film on the main surface of a semiconductor substrate, forming a dummy gate on the insulating film, doping impurity into the semiconductor substrate to form source and drain regions with the dummy gate used as a mask, forming spacer insulating films on side walls-of the dummy gate, removing the dummy gate to form an opening which exposes the surface of the first insulating film, forming an electrode layer which contains a preset metal element and contains Cu as a main component in the opening, and performing heat treatment to form a first ferroelectric film which contains a compound of the preset metal element and a constituent element of the first insulating film as a main component and having a dielectric constant larger than that of the first insulating film on an interface between the first insulating film and the electrode layer in a self-alignment fashion. - View Dependent Claims (15, 16, 17)
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Specification