Poor deposited step coverage (S/C) of carbon hard mask (HM) at alignment and overlay masks can cause worse overlay signal and further rework performance. A much better step coverage film can be obtained using C 2 H 2 as precursor owing to superior sticking coefficient (higher C/H ratio). This C 2 H 2 base amorphous (a-C) film property and etch selectivity are also compatible with other precursors at the same time. As to the rework ability, it improved a lot and the pattern is still clear even after five times of rework.
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