Photomask, in particular alternating phase shift mask, with compensation structure
View Patent ↗The invention relates to a method for the production of masks, in particular for the production of alternating phase shift masks ( 1 ), or of chromeless phase shift masks or phase shift masks structured by quartz etching, respectively, as well as to a mask ( 1 ), in particular photomask, for the production of semiconductor devices, comprising at least one product field area ( 6 a ) and a compensation structure ( 5 ) positioned outside the product field area ( 6 a ), wherein the compensation structure ( 5 ) comprises at least one electroconductive region ( 8 b ) that is electrically connected with the product field area ( 6 a ).
1. A mask, in particular photomask, for the production of semiconductor devices, comprising:
at least one product field area with a structure comprising at least two different depths; and
a compensation structure positioned outside and completely surrounding the at least one product field area, the compensation structure comprising at least two different depths substantially identical to the two different depths of the at least one product field area such that inner and outer portions of the at least one product field area have homogeneous etching process conditions, the compensation structure comprising at least one electrically conducting path-shaped area running through the compensation structure and electrically connected with the product field area.
2. The mask, in particular photomask, for the production of semiconductor devices, in accordance with claim 1 , wherein—viewed from the product field area—the electrically conducting area extends outwardly.
3. The mask, in particular photomask, for the production of semiconductor devices, in accordance with claim 2 , wherein the path of the electrically conducting area has a breadth of between 1 nm and 30 mm or 200 nm and 5 mm, respectively, in particular between 1 μm and 50 μm, e.g. between 5 μm and 25 μm.
4. The mask, in particular photomask, for the production of semiconductor devices, in accordance with claim 3 , wherein the electrically conducting area substantially extends over the entire breadth of the compensation structure.
5. The mask, in particular photomask, for the production of semiconductor devices, according to claim 4 , comprising a plurality of, in particular more than 10, 100, 1,000 or 10,000, electrically conducting areas that are electrically connected with the product field area.
6. The mask, in particular photomask, for the production of semiconductor devices, according to claim 5 , wherein—viewed from the product field area—the electrically conducting areas each extend outwardly.
7. The mask, in particular photomask, for the production of semiconductor devices, in accordance with claim 6 , wherein the plurality of electrically conducting areas form a grid structure.
8. The mask, in particular photomask, for the production of semiconductor devices, according to claim 7 , wherein the electrically conducting areas are designed of chrome.
9. The mask, in particular photomask, for the production of semiconductor devices, according to claim 8 , wherein electrically non-conductive regions are positioned between the electrically conducting areas.
10. The mask, in particular photomask, for the production of semiconductor devices, according to claim 9 , wherein a respective plurality of electrically non-conductive regions that are positioned side by side, in particular more than 3, 50, or 500 electrically non-conductive regions that are positioned side by side, alternatingly have respectively differing depths (t 0 , t 1 ).
11. The mask, in particular photomask, for the production of semiconductor devices, according to claim 10 , wherein the electrically non-conductive regions are designed of quartz.
12. The mask, in particular photomask, for the production of semiconductor devices, according to claim 11 , wherein the electrically non-conductive regions that are positioned between the electrically conducting areas have a rectangular, in particular square, or a round or oval, respectively, cross-section.
13. The mask, in particular photomask, for the production of semiconductor devices, according to claim 12 , wherein the compensation structure is frame-shaped.
14. The mask, in particular photomask, for the production of semiconductor devices, according to claim 13 , said mask comprising a quartz and/or a chrome layer.
15. The mask, in particular photomask, for the production of semiconductor devices, according to claim 14 , wherein the mask is an alternating phase shift mask, or a chromeless or a CPL (chromeless phase etch lithography) mask, respectively.
16. A method for the production of masks, in particular for the production of alternating phase shift masks, or of chromeless phase shift masks or phase shift masks structured by quartz etching, respectively, comprising at least one product field area with a structure comprising at least two different depths and a compensation structure positioned outside and completely surrounding the at least one product field area, characterized in that the method comprises the step: providing of the compensation structure with at least two different depths substantially identical to the two different depths of the at least one product field area such that inner and outer portions of the at least one product field area have homogeneous etching process conditions, and with at least one electrically conducting path-shaped area running through the compensation structure and electrically connected with the product field area.