Patent ID: 6521509
Filing Date: 2003-02-18
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device, comprising the step of:forming an underlying layer and a first layer which includes a silicon nitrate film, having an opening on a main surface of a semiconductor substrate, wherein said opening is formed by said underlying layer and a side surface of said first layer, said method further comprising the steps of: forming a groove having a sidewall that is continuously formed with a side surface of said first layer and said underlying layer by etching said semiconductor substrate using said first layer as a mask; oxidizing the side surface of said first layer to form an oxidized layer in contact with said underlying layer; forming a second layer for filling said groove such that it comes in contact with said oxidized layer; removing said first layer, with the oxidized layer in contact with said second layer remaining; and removing said underlying layer with said second layer filling said groove after removal of said first layer leaving a shoulder portion of the second layer extending from said groove over the main surface of the semiconductor substrate.