Method of fabricating a base layer circuit structure

Abstract

Methods of fabricating a base layer circuit structure are provided. One fabrication method includes: providing an alignment carrier having a support surface; forming a plurality of electrically conductive structures above the support surface of the alignment carrier; disposing a structural material around and physically contacting the side surfaces of the electrically conductive structures formed above the support surface, the structural material having an upper surface coplanar with or parallel to the upper surface of one or more of the electrically conductive structures; exposing, if covered, the upper surfaces of the electrically conductive structures to facilitate electrical connection to the structures; and separating the alignment carrier from the base layer circuit structure. The base layer circuit structure includes the plurality of electrically conductive structures and the structural material surrounding and physically contacting the electrically conductive structures.

What is claimed is: 
     
         1 . A method of fabricating a base layer circuit structure comprising:
 providing an alignment carrier comprising a support surface;   forming a plurality of electrically conductive structures above the support surface of the alignment carrier, each electrically conductive structure comprising at least one side surface, and an upper surface;   disposing a structural material around and physically contacting the at least one side surface of each electrically conductive structure of the plurality of electrically conductive structures formed above the support surface of the alignment carrier, the structural material having an upper surface substantially coplanar with or parallel to at least one upper surface of at least one electrically conductive structure of the plurality of electrically conductive structures;   exposing, if covered, the upper surfaces of the plurality of electrically conductive structures to facilitate electrical connection thereto; and   separating the alignment carrier from the base layer circuit structure, the base layer circuit structure comprising the plurality of electrically conductive structures and the structural material surrounding and physically contacting the plurality of electrically conductive structures.   
     
     
         2 . The method of  claim 1 , wherein the exposing comprises removing a portion of the structural material to expose the upper surfaces of the plurality of electrically conductive structures. 
     
     
         3 . The method of  claim 2 , further comprising, after the exposing, disposing a redistribution layer over the structural material and the plurality of electrically conductive structures, the redistribution layer making electrical interconnection to the plurality of electrically conductive structures. 
     
     
         4 . The method of  claim 3 , wherein disposing of the redistribution layer over the structural material and the plurality of electrically conductive structures occurs prior to the separating of the alignment carrier from the base layer circuit structure. 
     
     
         5 . The method of  claim 3 , wherein disposing of the redistribution layer over the structural material and the plurality of electrically conductive structures occurs subsequent to the separating of the alignment carrier from the base layer circuit structure. 
     
     
         6 . The method of  claim 2 , wherein the exposing further includes thinning the structural material to a predetermined thickness to expose the upper surfaces of the plurality of electrically conductive structures. 
     
     
         7 . The method of  claim 6 , wherein the exposing further comprises thinning at least one electrically conductive structure of the plurality of electrically conductive structures during the thinning of the structural material to the predetermined thickness. 
     
     
         8 . The method of  claim 6 , further comprising disposing, after the exposing, a redistribution layer over the structural material and the plurality of electrically conductive structures, the redistribution layer making electrical interconnection to the plurality of electrically conductive structures. 
     
     
         9 . The method of  claim 1 , wherein disposing the structural material further comprises applying a polymer resin comprising an inert filler, and wherein the method further comprises at least partially curing the polymer resin. 
     
     
         10 . The method of  claim 1 , wherein disposing of the structural material further comprises molding a polymer resin to the support surface and to the plurality of electrically conductive structures. 
     
     
         11 . The method of  claim 10 , wherein the exposing further comprises configuring the polymer resin to expose the upper surfaces of the plurality of electrically conductive structures. 
     
     
         12 . The method of  claim 11 , further comprising disposing, after the exposing, a redistribution layer over the structural material and the plurality of electrically conductive structures, the redistribution layer making electrical interconnection to the plurality of electrically conductive structures. 
     
     
         13 . The method of  claim 1 , wherein the forming comprises defining the plurality of electrically conductive structures over the support surface of the alignment carrier by lithography.