Patent ID: 7556900
Filing Date: 2009-07-07
Classification: G03F

Abstract:
1. In a photo lithography process on a photo resist coated substrate, a method for determining the effect of flare on line shortening, the method comprising: in a first exposure and at a first die position on the substrate, printing a dark-field mask including a flare pattern corresponding to one corner of the dark-field mask, a correction box opening, and a focus box pattern on the substrate; in a second exposure at the first die position, printing a clear-field mask including another flare pattern corresponding to another corner of the clear-field mask that is located opposite the one corner; at a second die position on the substrate, printing a composite mask pattern based on features of the dark-field mask and the clear-field mask; developing the printed patterns and obtaining measurements from the patterns in both X and Y directions, the measurements including determining the effect of flare as a function of the measured differences between a left-leg and right-leg of a given printed feature for the X-direction, and as a function of the differences between a top-leg and bottom-leg of a given printed feature for the Y-direction.