Patent ID: 8962483
Filing Date: 2015-02-24
Classification: H01L

Abstract:
1. A method comprising: providing a hardmask on a substrate; forming a mandrel layer on the hardmask comprising: first and second vertical portions extending along a vertical direction and separated by a horizontal distance; and a plurality of horizontal portions extending in a horizontal direction, wherein each of the horizontal portions is positioned between the first and second vertical portions and at a different position along the vertical direction; forming a spacer layer on outer edges of the mandrel layer; providing first and second block layers on the hardmask extending along the vertical direction and positioned between the first and second vertical portions, the first and second block layers being separated from each other; etching the substrate, forming recesses, the first and second block layers preventing one or more portions of the substrate from being etched, wherein the horizontal portions span the horizontal distance; providing the first and second block layers on the substrate adjacent to the first and second vertical portions, respectively; providing a first bitline adjacent to the first block mask and separated from a region between the first and second block masks; and providing a second bitline adjacent to the second block mask and separated from a region between the first and second block masks.