Method of forming a mask layout and layout formed by the same

摘要

A mask layout forming method includes designing an original layout in which a diagonal pattern of a first polygon is repeatedly arranged in a diagonal direction relative to a vertical-axis direction. Opposite edge sides of the diagonal pattern of the first polygon are corrected such that second polygons extending in a horizontal-axis direction are stacked at the opposite edge sides of the diagonal pattern of the first polygon to form a stair-shaped layout. The polygons are fractured in the horizontal-axis direction to provide data associated with the corrected layout to an electron beam exposure system. The diagonal pattern of the first polygon defines an active region and a device isolation layer along a 6F² cell layout or a 4F² cell layout.