Method for manufacturing a semiconductor device
First Claim
1. A method for manufacturing a semiconductor device comprising the steps of (a) forming a first mask member which has an opening to expose a desired portion of a major surface of a semiconductor substrate;
- (b) ion-implanting an impurity of the same conductivity type as that of said semiconductor substrate through said opening of said first mask member to form an impurity region of a high concentration in a surface layer of said semiconductor substrate;
(c) substantially forming a second mask member only on a side surface of said opening of said first mask member while said first mask member is left as it is;
(d) forming a groove by selectively etching said semiconductor substrate by using said first and second mask members, while at the same time leaving the impurity region of the high concentration at least on a side surface of said groove; and
(e) burying an insulating isolation member in said groove.
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Accused Products
Abstract
The invention provides a method for manufacturing a semiconductor device, having the steps of: forming a first mask member which has an opening to expose a desired portion of one major surface of a semiconductor substrate; doping an impurity which has the same conductivity type as that of the semiconductor substrate through the opening of the first mask member to form an impurity region of a high concentration in the surface layer of the semiconductor substrate; forming a second mask member on the side surface of the opening of the first mask member while the first mask member is left as it is; forming a groove by selectively etching the semiconductor substrate using the first and second mask members, and at the same time leaving an impurity region of the high concentration at least on the side surface of the groove; and burying an insulating isolation material in the groove.
45 Citations
7 Claims
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1. A method for manufacturing a semiconductor device comprising the steps of (a) forming a first mask member which has an opening to expose a desired portion of a major surface of a semiconductor substrate;
- (b) ion-implanting an impurity of the same conductivity type as that of said semiconductor substrate through said opening of said first mask member to form an impurity region of a high concentration in a surface layer of said semiconductor substrate;
(c) substantially forming a second mask member only on a side surface of said opening of said first mask member while said first mask member is left as it is;
(d) forming a groove by selectively etching said semiconductor substrate by using said first and second mask members, while at the same time leaving the impurity region of the high concentration at least on a side surface of said groove; and
(e) burying an insulating isolation member in said groove. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- (b) ion-implanting an impurity of the same conductivity type as that of said semiconductor substrate through said opening of said first mask member to form an impurity region of a high concentration in a surface layer of said semiconductor substrate;
Specification