Patent ID: 9214356
Filing Date: 2015-12-15
Classification: H01L

Abstract:
1. A method comprising: forming a material layer over a semiconductor substrate; forming a first mandrel feature and a second mandrel feature over the material layer; forming spacers adjacent to sidewalls of the first mandrel feature and the second mandrel feature; removing the first mandrel feature and the second mandrel feature; forming a patch pattern over the spacers; and patterning the material layer using the patch pattern and the spacers as a mask to form a patterned material layer, wherein the patterned material layer includes a first feature and a second feature, wherein the first feature is located at a distance in a range from about n+0.3 times of a pitch to about n+0.8 times of the pitch away from the second feature, wherein n is an integer number, and wherein the pitch is a distance between the first and second features plus a width of the first feature.