Semiconductor device with loop line pattern structure, method and alternating phase shift mask for fabricating the same
AssigneeProMOS Technologies Inc.
InventorsBrian S. Lee, Chih-Yu Lee
Life of this patent
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Abstract
An alternating phase shift mask with dark loops thereon, a memory array fabricated with the alternating phase shift mask, and a method of fabricating the memory. The dark loops in the mask always separate first regions with 180° phase difference from second regions with 0° phase difference to define active areas or gate-lines in a DRAM chip. By using the alternating phase shift mask to pattern gate-lines or active areas in a DRAM array, no unwanted image is created in the DRAM array and only one exposure is needed to achieve high resolution requirement.
Claims2
A alternating phase-shift mask for defining gate patterns on a DRAM chip with open bit-line architecture, comprising:
- opaque lines for defining gate-lines of a memory array in the DRAM chip, each opaque line having:
- a dark loop;
- a first portion enclosed and defined by the dark loop;
- and
- a second portion adjacent the dark loop;
- wherein, during a lithography process, first light traversing the first portion and second light traversing the second portion are 180° out of phase.
A alternating phase shift mask for defining active areas on a DRAM chip, comprising:
- opaque lines for defining active areas of a memory array in the DRAM chip, each opaque line having:
- a dark loop;
- a first portion enclosed and defined by the dark loop;
- and
- a second portion adjacent the dark loop;
- wherein, during a lithography process, first light traversing the first portion and second light traversing the second portion are 180° out of phase.
Dependencies are inferred from the claim text.