SEMICONDUCTOR DEVICE AND METHOD FOR MANUFACTURING THE SAME
First Claim
Patent Images
1. A semiconductor device comprising:
- a semiconductor substrate;
a first conductive type of a first conductive type well formed in the semiconductor substrate;
a second conductive type of a second conductive type well formed in the semiconductor substrate and formed adjacent to the first conductive type well;
a gate insulating film arranged over the semiconductor substrate across a part of the first conductive type well and a part of the second conductive type well;
a gate electrode arranged over the gate insulating film;
the second conductive type of a second impurity region formed over a surface layer of the first conductive type well;
the second conductive type of a first impurity region formed over a surface layer of the second conductive type well and formed apart from the gate electrode in a plan view; and
a field drain insulating part in which at least a part of the field drain insulating part is formed under the gate insulating film and which is formed over a surface of the second conductive type well between under the gate insulating film and the first impurity region,wherein the field drain insulating part comprises;
a first insulating film positioned at least in a center part of the field drain insulating part in a plan view; and
a high dielectric constant insulating film arranged at least at a region close to the first impurity region in an edge of a bottom surface of the field drain insulating part and having a higher dielectric constant than the first insulating film.
1 Assignment
0 Petitions
Accused Products
Abstract
A field drain insulating part has a first insulating film and a high dielectric constant insulating film. The first insulating film is positioned at least in the center of the field drain insulating part in a plan view. The high dielectric constant insulating film is positioned at a part close to a drain region in the edge of the bottom surface of the field drain insulating part, and has a higher dielectric constant than the first insulating film. The high dielectric constant insulating film is not positioned in the center of the field drain insulating part in a plan view.
-
Citations
15 Claims
-
1. A semiconductor device comprising:
-
a semiconductor substrate; a first conductive type of a first conductive type well formed in the semiconductor substrate; a second conductive type of a second conductive type well formed in the semiconductor substrate and formed adjacent to the first conductive type well; a gate insulating film arranged over the semiconductor substrate across a part of the first conductive type well and a part of the second conductive type well; a gate electrode arranged over the gate insulating film; the second conductive type of a second impurity region formed over a surface layer of the first conductive type well; the second conductive type of a first impurity region formed over a surface layer of the second conductive type well and formed apart from the gate electrode in a plan view; and a field drain insulating part in which at least a part of the field drain insulating part is formed under the gate insulating film and which is formed over a surface of the second conductive type well between under the gate insulating film and the first impurity region, wherein the field drain insulating part comprises; a first insulating film positioned at least in a center part of the field drain insulating part in a plan view; and a high dielectric constant insulating film arranged at least at a region close to the first impurity region in an edge of a bottom surface of the field drain insulating part and having a higher dielectric constant than the first insulating film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method for manufacturing a semiconductor device, the method comprising the steps of:
-
forming a groove in a semiconductor substrate; forming a field drain insulating part by embedding an insulating film into the groove; forming a gate insulating film and a gate electrode over the semiconductor substrate; and forming a first impurity region and a second impurity region in a position facing each other through the gate electrode in a plan view, wherein the semiconductor substrate has a first conductive type of a first conductive type well and a second conductive type of a second conductive type well adjacent to the first conductive type well, and wherein the gate insulating film is arranged over the semiconductor substrate across a part of the first conductive type well and a part of the second conductive type well, and wherein the second impurity region is the second conductive type and is formed over a surface layer of the first conductive type well, and wherein the first impurity region is the second conductive type and is formed over a surface layer of the second conductive type well and is formed apart from the gate electrode in a plan view, and wherein at least a part of the field drain insulating part is formed under the gate insulating film and the field drain insulating part is formed over the surface layer of the second conductive type well between under the gate insulating film and the first impurity region, and wherein the step of forming a field drain insulating part includes the steps of; forming a high dielectric constant film in the groove; etching back the high dielectric constant film, and thereby forming the high dielectric constant film at least at a part facing to the first impurity region in the edge of the bottom surface of the groove. - View Dependent Claims (13, 14, 15)
-
Specification