Patent ID: 8980756
Filing Date: 2015-03-17
Classification: H01L

Abstract:
1. A method for device fabrication, comprising: forming a first mask over a semiconductor substrate; photolithographically forming a first pattern of features over the first mask, the features of the first pattern of features having a first width; forming a second pattern of features over the first mask using spacers formed by pitch multiplication subsequent to photolithographically forming the first pattern or features, features of the second pattern of features having a second width less than the first width; transferring the first pattern of features and the second pattern of features to the first mask; forming a second mask over the first pattern of features and the second pattern of features, leaving portions of the first pattern of features and the second pattern of features exposed; and etching the exposed portions of the first pattern of features and the second pattern of features to remove the exposed portions of the first pattern of features and the second pattern of features.