Patent ID: 8057692

Claim:
A method of forming a semiconductor device comprising: providing a feature layer on a substrate; providing a mask layer on the feature layer; removing a portion of the mask layer in a first region of the semiconductor device where fine features of the feature layer are to be located, the mask layer remaining in a second region of the semiconductor device where broad features of the feature layer are to be located; providing a mold mask pattern on the feature layer in the first region and on the mask layer in the second region; providing a spacer layer on the mold mask pattern in the first region and in the second region; performing an etching process to etch the spacer layer so that spacers remain at sidewalls of pattern features of the mold mask pattern, and to etch the mask layer in the second region to provide mask layer patterns in the second region; and etching the feature layer using the mask layer patterns as an etch mask in the second region and using the spacers as an etch mask in the first region to provide a feature layer pattern having fine features in the first region and broad features in the second region.