Methods of forming conductive vias through substrates, and structures and assemblies resulting therefrom
Methods of forming conductive elements on and in a substrate include forming a layer of conductive material over a surface of a substrate prior to forming a plurality of vias through the substrate from an opposing surface of the substrate to the layer of conductive material. In some embodiments, a temporary carrier may be secured to the layer of conductive material on a side thereof opposite the substrate prior to forming the vias. Structures, including workpieces formed using such methods, are also disclosed.
1. A method for forming conductive elements on and in a substrate, comprising:
at least substantially entirely covering a first major surface of a substrate with a first conductive material;
subsequently forming a plurality of vias through the substrate from a second major surface opposing the first major surface to the first conductive material;
forming each via of the plurality of vias to comprise a bottom surface comprising a portion of the first conductive material; and
depositing a second conductive material within each via of the plurality of vias and establishing electrical contact between the second conductive material within each via and the first conductive material to form a plurality of conductive vias extending through the substrate.
2. The method of claim 1 , wherein forming a first conductive material comprises forming a first conductive material over a first major surface of a semiconductor wafer.
3. The method of claim 1 , further comprising forming a third conductive material over the second major surface of the substrate.
4. The method of claim 3 , further comprising patterning the third conductive material to form a plurality of conductive pads.
5. The method of claim 4 , wherein forming a plurality of vias further comprises forming each via of the plurality of vias through a conductive pad of the plurality of conductive pads.
6. The method of claim 1 , further comprising forming dielectric material on at least one sidewall within each via of the plurality of vias prior to depositing a second conductive material within each via of the plurality of vias.
7. The method of claim 6 , wherein forming dielectric material comprises:
depositing the dielectric material over the substrate and on exposed surfaces within each via of the plurality of vias; and
anisotropically etching the dielectric material to expose the first conductive material within each via of the plurality of vias.
8. The method of claim 7 , wherein depositing the dielectric material comprises depositing a pulsed deposition oxide material.
9. The method of claim 1 , further comprising patterning the first conductive material on the first major surface of the substrate prior to forming the plurality of vias.
10. The method of claim 9 , wherein patterning the first conductive material comprises forming a plurality of at least one of conductive pads and conductive traces from the first conductive material.
11. The method of claim 10 , wherein forming a plurality of vias comprises forming each via of the plurality of vias through the substrate to a conductive pad of the plurality of conductive pads.
12. The method of claim 11 , further comprising providing a conductive bump on each conductive pad of the plurality of conductive pads and directly vertically over a conductive via of the plurality of conductive vias.
13. The method of claim 1 , further comprising adhering a temporary carrier to the substrate on a side thereof adjacent the second major surface and removing material from the first major surface of the substrate prior to forming the first conductive material over the first major surface of the substrate.
14. The method of claim 13 , further comprising:
removing the temporary carrier from the side of the substrate adjacent the second major surface; and
adhering a temporary carrier to a side of the substrate adjacent the first major surface.
15. The method of claim 14 , wherein forming a plurality of vias comprises forming a plurality of vias through the substrate while the temporary carrier is adhered to the side of the substrate adjacent the first major surface.
16. A method for forming conductive elements through a semiconductor wafer, comprising:
at least substantially covering a first major surface of a semiconductor wafer with a first conductive material;
attaching a temporary carrier to the first conductive material on a side thereof opposite the semiconductor wafer;
subsequently forming a plurality of vias through the semiconductor wafer from a second major surface of the semiconductor wafer to the first conductive material; and
depositing a second conductive material within each via of the plurality of vias and establishing electrical contact between the second conductive material within each via and the first conductive material to form a plurality of conductive vias extending through the semiconductor wafer.
17. The method of claim 16 , further comprising patterning the first conductive material.
18. The method of claim 17 , wherein patterning the first conductive material comprises forming a redistribution layer.
19. The method of claim 17 , wherein patterning the first conductive material comprises patterning the first conductive material prior to attaching a temporary carrier to the first conductive material on a side thereof opposite the semiconductor wafer.
20. The method of claim 17 , wherein forming a plurality of vias further comprises forming each via of the plurality of vias through a conductive pad on the second major surface of the semiconductor wafer.