Patent ID: 7989355
Filing Date: 2011-08-02
Classification: H01L,Y10S

Abstract:
1. A method of fabricating a semiconductor device comprising: forming a mask layer over a semiconductor substrate; forming a dummy layer having a first dummy feature and a second dummy feature over the mask layer, wherein a width of the first dummy feature does not exceed a width of the second dummy feature; forming first and second spacer roofs to cover a top portion of the first and second dummy features, respectively, and forming first and second spacer sleeves to encircle side portions of the first and second dummy features, respectively, wherein the first and second spacer roofs and the first and second spacer sleeves are formed in a same process and include same materials; removing the first spacer roof and the first dummy feature while protecting the second dummy feature; after removing the first dummy feature, removing a first end portion and a second end portion of the first spacer sleeve to form a plurality of spacer fins; and patterning the mask layer using the spacer fins as a first mask element and the second dummy feature as a second mask element.