Patent ID: 7674703
Filing Date: 2010-03-09
Classification: G03F,H01L

Abstract:
1. A method of manufacturing a semiconductor device, the method comprising: exposing a first photo resist layer using a first light beam thereby forming first features, wherein the first exposure is performed by the first light beam passing through a first dipole illuminator and then a first mask, wherein a dipole axis of the first dipole illuminator is oriented in a first direction; and after exposing the first photo resist layer, forming second features using a second exposure with a second light beam, wherein the second exposure is performed by the second light beam passing through a second dipole illuminator and then a second mask, wherein a dipole axis of the second dipole illuminator is oriented in a second direction, wherein the first, and the second features comprise a pattern for forming contact holes, and wherein the first direction and the second direction are not perpendicular.