Patent ID: 8786833
Filing Date: 2014-07-22
Classification: G03F,H01L,Y10T

Abstract:
1. A lithographic method comprising: providing a first layer of material on a surface of a substrate; exposing a part of the first layer of material to a beam of radiation in order to form a first pattern feature in the first layer of material, the first pattern feature having sidewalls; providing a second layer of material over the first pattern feature, the second layer of material providing a coating on sidewalls of the first pattern feature; removing a portion of the second layer of material, leaving a coating of the second layer of material on sidewalls of the first pattern feature; removing the first pattern feature formed from the first layer of material, leaving on the substrate at least a part of the second layer of material that formed a coating on sidewalls of that first pattern feature, the part of the second layer of material left on the substrate forming second pattern features in locations adjacent to the locations of sidewalls of the removed first pattern feature, and adjusting a distance between two adjacent second pattern features respectively formed on two adjacent first pattern features by controlling a focal property of the beam of radiation during exposure of the first layer of material so as to control a sidewall angle of said sidewalls, thereby affecting a dimension of the coating of the second layer of material on the sidewalls of the first pattern feature.