Patent ID: 8802510
Filing Date: 2014-08-12
Classification: H01L

Abstract:
1. A method, comprising forming a mask layer and an underlying layer over a semiconductor substrate; forming a plurality of parallel lines in the mask layer having a line width and a line spacing distance and having a line pitch that is the sum of the width and the spacing distance; using a photolithographic process, patterning a photoresist to cover a plurality of the lines in the mask layer corresponding to desired lines, and patterning the photoresist to cover a portion of at least two temporary lines in the mask layer corresponding to temporary lines lying adjacent to the desired lines and on the outside of a plurality of desired lines, leaving a portion of the temporary lines exposed; etching the plurality of lines in the mask layer to remove a portion of each of the at least two temporary lines while retaining the covered portion of the at least two temporary lines; and etching the mask layer and an underlying layer using the desired lines and the temporary lines as an etch mask, removing at least a portion of the underlying layer beneath the at least two temporary lines while the portions of the underlying layer lying beneath the lines corresponding to the desired lines are retained.