Patent ID: 7772069
Filing Date: 2010-08-10
Classification: H01L

Abstract:
1. A method of forming a semiconductor device, comprising: forming a mask layer on a semiconductor substrate, the mask layer having vertically extending portions and horizontally extending portions, the vertically extending portions having a thickness selected to provide a desired line width to an underlying structure to be formed using the mask layer and a height greater than a height of the horizontally extending portions; and forming the underlying structure using the mask layer, wherein forming the underlying structure comprises forming mask patterns, wherein the semiconductor device comprises a memory device and wherein forming the underlying structure further comprises forming word lines using the mask patterns, wherein forming the mask patterns includes concurrently forming a string selection mask pattern, a ground selection mask pattern and a plurality of cell mask patterns extending between the string selection mask pattern and the ground selection mask pattern, the string selection mask pattern and the ground selection mask pattern having a line width greater than a line width of the cell mask patterns and wherein forming the word lines comprises forming the word lines using the cell mask patterns and wherein forming the underlying structure further comprises forming a string selection line using the string selection mask pattern and forming a ground selection line using the ground selection mask pattern.