US Patent 10481483 Lithography mask and method
Patent 10481483 was granted and assigned to Taiwan Semiconductor Manufacturing Company on November, 2019 by the United States Patent and Trademark Office.
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In an embodiment, a photomask includes: a substrate over a first conductive layer, the substrate formed of a low thermal expansion material (LTEM); a second conductive layer over the first conductive layer; a reflective film stack over the substrate; a capping layer over the reflective film stack; an absorption layer over the capping layer; and an antireflection (ARC) layer over the absorption layer, where the ARC layer and the absorption layer have a plurality of openings in a first region exposing the capping layer, where the ARC layer, the absorption layer, the capping layer, and the reflective film stack have a trench in a second region exposing the second conductive layer.
US Patent 10481483 Lithography mask and method
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