Patent ID: 8586429
Filing Date: 2013-11-19
Classification: H01L

Abstract:
1. A method of forming a series of spaced trenches into a substrate, comprising: forming a plurality of spaced lines over a substrate; forming anisotropically etched sidewall spacers on opposing sides of the spaced lines, individual of the lines having greater maximum width than minimum width of space between immediately adjacent of the spacers between immediately adjacent of the lines; removing the spaced lines to form a series of alternating first and second mask openings between the spacers, the first mask openings being located where the spaced lines were located and being wider than the second mask openings, the respective first openings having laterally innermost edges defined by laterally innermost edges of the spacers, the respective second openings having laterally innermost edges defined by laterally outermost edges of the spacers; and simultaneously etching alternating first and second trenches into the substrate through the alternating first and second mask openings, respectively, to form the first trenches to be wider and deeper within the substrate than are the second trenches.