Patent ID: 8679884
Filing Date: 2014-03-25
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor apparatus, comprising: the first step of thermally oxidizing a silicon substrate using as a mask a silicon nitride film disposed so as to cover a first portion of the silicon substrate without covering a second portion adjacent to the first portion, thus forming a silicon oxide film including a main portion on the second portion and a sub portion between the first portion and the silicon nitride film; the second step of forming a first conductivity type impurity region having a conductivity of a first type under the silicon oxide film; and the third step of forming a semiconductor element including a second conductivity type impurity region having a conductivity of a second type opposite to the first type, in the first portion after removing the silicon nitride film, wherein the second step includes performing angled ion implantation into a region under the sub portion using the silicon nitride film as a mask.