Blank masks for extreme ultra violet lithography, methods of fabricating the same, and methods of correcting registration errors thereof
View Patent ↗Blank masks for extreme ultraviolet (EUV) photolithography are provided. The blank mask includes a substrate having a first surface and a second surface which are opposite to each other, a reflection layer disposed on the first surface of the substrate to reflect extreme ultraviolet (EUV) rays, an absorption layer disposed on the reflection layer opposite to the substrate to absorb extreme ultraviolet (EUV) rays, and a conductive layer disposed on the second surface of the substrate to expose portions of the substrate. Related methods are also provided.
1. A blank mask for extreme ultraviolet (EUV) photolithography, the blank mask comprising:
a substrate having a first surface and a second surface which are opposite to each other, the substrate having a plurality of trenches having a predetermined depth from the second surface;
a reflection layer disposed on the first surface of the substrate to reflect extreme ultraviolet (EUV) rays;
an absorption layer disposed on the reflection layer opposite to the substrate to absorb extreme ultraviolet (EUV) rays; and
a conductive layer disposed in the trenches, wherein a surface of the conductive layer is coplanar with the second surface of the substrate.
2. The blank mask of claim 1 , wherein the trenches are uniformly distributed throughout the second surface.
3. The blank mask of claim 1 , wherein the conductive layer has a substantially checkerboard shape or a mesh shape.
4. The blank mask for extreme ultraviolet (EUV) photolithography, the blank mask comprising:
a substrate having a first surface and a second surface which are opposite to each other;
a reflection layer disposed on the first surface of the substrate to reflect extreme ultraviolet (EUV) rays;
an absorption layer disposed on the reflection layer opposite to the substrate to absorb extreme ultraviolet (EUV) rays;
an insulation layer on the second surface of the substrate, the insulation layer having a plurality of trenches to expose portions of the substrate; and
a conductive layer disposed in the trenches, wherein a surface of the conductive layer is coplanar with the surface of the insulation layer.
5. The blank mask of claim 4 , wherein the conductive layer has a substantially checkerboard shape or a mesh shape.