Semiconductor wafer having embedded electroplating current paths to provide uniform plating over wafer surface
A semiconductor wafer having multi-layer metallization structures that are fabricated to include embedded interconnection structures which serve as low-resistance electroplating current paths to conduct bulk electroplating current fed to portions of a metallic seed layer at peripheral surface regions of the wafer to portions of the metallic seed layer at inner/central surface regions of the semiconductor wafer to achieve uniformity in metal plating in chip regions across the wafer.
1. A semiconductor wafer, comprising:
a plurality of chip regions formed on an active surface of the wafer and separated by scribe areas, each chip region comprising an active circuit region and a moisture barrier region (MOB), and a multi-layer interconnect structure including a first metallization layer and a second metallization layer; and
an embedded interconnection structure formed as part of the first metallization layer to electrically couple two or more chip regions,
wherein the embedded interconnection structure provides an electrical path to conduct bulk electroplating current to each of the electrically coupled chip regions including the MOBs and to feed said electroplating current to those regions of a metallic seed layer within, or in proximity to, each of the electrically coupled chip regions, to perform an electroplating process to form the second metallization layer, wherein each chip region further comprises a crack stop region, and wherein the embedded interconnection structure comprises a continuous conductive structure that connects the crack stop regions of each of the electrically coupled chip regions.
2. The semiconductor wafer of claim 1 , wherein each chip region further comprises a crack stop region, and wherein the embedded interconnection structure comprises a continuous conductive structure that connects the MOB regions of the electrically coupled chip regions.
3. The semiconductor wafer of claim 1 , wherein the embedded interconnection structure comprises a continuous conductive structure starting from a first chip region located at first peripheral region of the wafer and terminating at a second chip region located at a second peripheral region of the wafer.
4. The semiconductor wafer of claim 1 , wherein the first and second metallization layers are adjacent metallization layers.
5. The semiconductor wafer of claim 1 , wherein the first and second metallization layers are separated by one or more metallization layers interposed between the first and second metallization layers.
6. The semiconductor wafer of claim 1 , wherein the embedded interconnection structure comprises a metallic via trench structure.
7. The semiconductor wafer of claim 1 , wherein the embedded interconnection structure comprises a metallic line trench structure.
8. A method for fabricating interconnect layers of a semiconductor wafer, comprising:
defining a plurality of chip regions on an active surface of a semiconductor wafer, where each chip region comprises an active circuit region, a moisture barrier (MOB) region surrounding the active circuit region, and a crack stop region surrounding the active circuit region;
forming a multi-layer interconnect structure including a first metallization layer and a second metallization layer in each of the chip regions, wherein forming the multi-layer interconnect structure comprises:
forming an embedded interconnection structure as part of the first metallization layer to electrically couple two or more chip regions;
forming the second metallization level by electroplating a metallic material on a metallic seed layer using the embedded interconnection structure to conduct bulk electroplating current to each of the electrically coupled chip regions and to feed said electroplating current to those regions of the metallic seed layer within, or in proximity to, each of the electrically coupled chip regions; and
forming the embedded interconnection structure as a continuous conductive structure that connects the crack stop regions of each of the electrically coupled chip regions.
9. The method of claim 8 , comprising forming the embedded interconnection structure as a continuous conductive structure that connects the MOB regions of the electrically coupled chip regions.
10. The method of claim 8 , wherein the embedded interconnection structure is formed as a continuous conductive structure that extends from a first chip region located at first peripheral region of the wafer and terminates at a second chip region located at a second peripheral region of the wafer.
11. The method of claim 8 , wherein the first and second metallization layers are adjacent metallization layers.
12. The method of claim 8 , wherein the first and second metallization layers are separated by one or more metallization layers formed between the first and second metallization layers.
13. The method of claim 8 , wherein the embedded interconnection structure comprises a metallic via trench structure.
14. The method of claim 8 , wherein the embedded interconnection structure comprises a metallic line trench structure.