Patent ID: 7897058
Filing Date: 2011-03-01
Classification: H01L

Abstract:
1. A device manufacturing method using a lithographic apparatus, the method comprising: printing an array of sacrificial features on a first layer of a substrate, the array of sacrificial features having a first number of features per unit area; providing a substantially conformal coating to the array of sacrificial features so as to form a first mask defining a first array of holes, the first array of holes being interleaved with the array of sacrificial features and having the first number of features per unit area; removing the sacrificial features so as to form further holes in the first mask that, with the first array of holes, define a second array of holes having a second number of features per unit area that is double the first number of features per unit area; providing a second mask that is above and covers, a selected part of the second array of holes; and processing a part of the first layer not covered by the first and second masks.