Patent ID: 6365456
Filing Date: 2002-04-02
Classification: H01L

Abstract:
A process for manufacturing portions of device regions formed on a semiconductor substrate comprising:forming a stack structure on the semiconductor substrate including at least a first layer to be defined and a second protective layer; defining the device regions by photolithography using a first photoresist mask having â€œdefinition along a first directionâ€ , to thereby define in said second protective layer a plurality of parallel strips which delimit a first dimension of the device regions to be formed, the first photoresist mask defining opposite first sides of each of the parallel strips; etching away first portions of said second protective layer to define said plurality of parallel strips; photolithographing using a second photoresist mask having â€œdefinition along a second directionâ€  to define a plurality of islands in said plurality of parallel strips, the second photoresist mask defining opposite second sides of each of the islands, the second sides being orthogonal to the first sides; etching away second portions of said second protective layer to define said plurality of islands; and etching away said first layer to define the device regions, using said plurality of islands as a mask.