Photomask Layout With Protrusions for Lithography Pattern Fidelity

The patent applies preliminary action by adding extension portions with protruding portions to the photomask layout patterns before the lithography process. These protruding portions extend beyond the edges of adjacent layout patterns and are designed to compensate for anticipated photoresist pattern deformations during exposure and development. By pre-positioning these compensatory features in the photomask design, the final photoresist pattern achieves the desired dimensions and shape without deformation issues such as necking or line end shortening.

The patent applies local quality by adding extension portions only to specific layout patterns where deformation compensation is needed, rather than uniformly modifying all patterns. The protruding portions are strategically positioned at edges adjacent to other layout patterns, with specific dimensions and spacing tailored to local geometric requirements. This localized approach enhances process window and prevents deformation at critical locations while minimizing overall photomask complexity and maintaining manufacturability.