Patent ID: 7569485
Filing Date: 2009-08-04
Classification: H01L,Y10S

Abstract:
1. A method of forming an opening in a layer of a semiconductor device in a process, comprising: forming an etch stop layer having a thickness in the range of about 500 to 1000 angstroms on the layer of the semiconductor device; etching the layer according to a first set of etching parameters; forming a first opening through the etch stop layer into the semiconductor device having a width dimension using the first set of etching parameters with a first resist mask over the layer of the semiconductor device; removing the first resist mask; applying a second resist mask to the semiconductor device having an second opening larger than the first opening formed in the etch stop layer and the semiconductor device, the alignment of the second resist mask regarding the etch stop layer on the semiconductor device free of precise alignment of the second resist mask to the width dimension of the first opening to expose a portion of a top surface of the etch stop layer; further etching the layer according to a second set of etching parameters using a second set of etching parameters with the second resist mask, the use of the second set of etching parameters occurring after removing the first resist mask; contacting a portion of the top surface of the etch stop layer during the further etching of the semiconductor device; and forming a second opening in the semiconductor device having a width of the first opening.