Defect repair method, in particular for repairing quartz defects on alternating phase shift masks
View Patent ↗The invention relates to a defect repair method, in particular for repairing quartz defects on alternating phase shift masks, wherein, for repairing defects ( 5 ) existing on one and the same component ( 1 ), both, defect repair method steps substantially based on mechanical processes (S 3 ), in particular nanomachining method steps, and defect repair method steps substantially based on etching processes (S 2 ), in particular FIB (Focused Ion Beam) method steps, are used. Moreover, the invention relates to a component ( 1 ), in particular a photomask, repaired by making use of such a defect repair method.
1. A defect repair method, in particular for repairing quartz defects on alternating phase shift masks, for repairing one and the same defect, the method comprising:
performing defect repair method steps substantially based on etching processes; and
performing defect repair method steps substantially based on mechanical processes thereafter,
wherein the step of performing repair method steps substantially based on etching processes includes processing the defect in a central region of the defect to completely remove the defect in the central region and processing the defect in an edge region of the defect to partially remove the defect in the edge region,
wherein in the edge region in relation to the original height of the defect, between 20% and 50% of the defect is not removed prior to the step of performing defect repair method steps substantially based on mechanical processes.
2. The defect repair method according to claim 1 , wherein the defect repair method steps substantially based on mechanical processes are nanomachining method steps.
3. The defect repair method according to claim 2 , wherein the defect repair method steps substantially based on etching processes comprise gas injection method steps.
4. The defect repair method according to claim 3 , wherein the defect repair method steps substantially based on etching processes comprise a step of emitting ion beams.
5. The defect repair method according to claim 4 , wherein the defect repair method steps substantially based on etching processes include FIB (Focused Ion Beam) method steps.
6. The defect repair method according to claim 1 , wherein the defect is one of: a quartz defect and a quartz bump.
7. The defect repair method according to claim 1 , wherein during the step of performing defect repair method steps substantially based on etching processes, a second defect is not repaired at an edge region.
8. The defect repair method according to claim 7 , wherein at least 50% of the second defect is not removed at the edge region during the step of performing defect repair method steps substantially based on etching processes.
9. The defect repair method according to claim 1 , wherein the defect repair method steps substantially based on etching processes comprise gas injection method steps.
10. The defect repair method according to claim 1 , wherein the defect repair method steps substantially based on etching processes comprise a step of emitting ion beams.
11. The defect repair method according to claim 1 , wherein the defect repair method steps substantially based on etching processes include FIB (Focused Ion Beam) method steps.
12. The defect repair method according to claim 1 , wherein during the step of performing defect repair method steps substantially based on etching processes, a second defect is only partially repaired at an edge region.
13. The defect repair method according to claim 12 , wherein the edge region of the second defect, which had been only partially repaired, is at least partially repaired during the subsequently performed defect repair method steps substantially based on mechanical processes.
14. The defect repair method according to claim 12 , wherein at least 20% of the second defect is not removed at the edge region during the step of performing defect repair method steps substantially based on etching processes.
15. The defect repair method according to claim 14 , wherein the edge region of the second defect, which had not been repaired, is at least partially repaired during the subsequently performed defect repair method steps substantially based on mechanical processes.
16. A method for repairing quartz defects on alternating phase shift masks comprising:
etching away an inner portion of a quartz defect on an alternating phase shift mask completely;
etching away an edge region of the quartz defect to remove between 30% and 80% of the edge region; and
mechanically removing the remaining 20% to 70% of the edge region of the quartz defect.
17. The method of claim 16 , wherein the step of etching away an edge region of the quartz defect includes etching away the edge region of the quartz defect to remove between 50% and 70% of the edge region and the step of mechanically removing includes mechanically removing the remaining 30% to 50% of the edge region of the quartz defect.
18. The method of claim 16 , wherein the steps of etching away including emitting ion beams to the inner portion and the edge portion.