Patent ID: 6610461
Filing Date: 2003-08-26
Classification: G03F

Abstract:
A method for manufacturing a semiconductor device, comprising:forming a first layer on a semiconductor substrate; forming a photosensitive layer on said first layer; forming a plurality of first openings in said photosensitive layer a photolithography process using a reticle having an accessory pattern divided into a set of continuously arranged sub-patterns; forming a plurality of second openings in said first layer by etching said first layer using said photosensitive layer having said plurality of first openings as a mask; removing said photosensitive layer after said plurality of second openings are formed; forming a second layer having a thickness less than a width of each of said plurality of second openings after said photosensitive layer is removed; coating a third layer on said second layer so that said third layer is buried in said plurality of second openings on said second layer, a surface of said third layer being flattened; etching back said third layer to expose said second layer while leaving said third layer in said plurality of second openings; etching back said second layer to make said second layer form a U-shape after said third layer is etched back; and removing sequentially said third and first layers after said second layer is etched back, so that said second U-shape layer is formed on said semiconductor substrate.