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Structure and methods of forming stacked semiconductor chips are described. In one embodiment, a method of forming a semiconductor chip includes forming an opening for a through substrate via from a top surface of a first substrate. The sidewalls of the opening are lined with an insulating liner and

Structure and methods of forming stacked semiconductor chips are described. In one embodiment, a method of forming a semiconductor chip includes forming an opening for a through substrate via from a top surface of a first substrate. The sidewalls of the opening are lined with an insulating liner and the opened filled with a conductive fill material. The first substrate is etched from an opposite bottom surface to form a protrusion, the protrusion being covered with the insulating liner. A resist layer is deposited around the protrusion to expose a portion of the insulating liner. The exposed insulating liner is etched to form a sidewall spacer along the protrusion.

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1. A semiconductor device comprising: a substrate having a first side and a second side, the second side being opposite the first side;a through substrate via (TSV) extending from the first side to the second side of the substrate, the TSV comprising:a conductive fill material;a liner material surro

1. A semiconductor device comprising: a substrate having a first side and a second side, the second side being opposite the first side;a through substrate via (TSV) extending from the first side to the second side of the substrate, the TSV comprising:a conductive fill material;a liner material surrounding the conductive fill material; anda protrusion from the first side, the protrusion comprising: a first portion extending a first height from the first side, the first portion being surrounded by the liner material; anda second portion having a conductive coating on a first surface of the conductive fill material, the first surface being substantially parallel with the first side of the substrate, the conductive coating and the liner material being vertically separated by the second portion of the protrusion; andan underfill material surrounding the protrusion of the TSV. 2. The semiconductor device of claim 1, wherein the underfill material directly contacts the conductive fill material in the second portion of the protrusion. 3. The semiconductor device of claim 1, wherein the first height is less than a total height of the protrusion. 4. The semiconductor device of claim 1, wherein the second portion is substantially free from liner material. 5. The semiconductor device of claim 1, wherein the substrate comprises a semiconductor wafer comprising active circuitry on the second side of the substrate. 6. The semiconductor device of claim 1, wherein the liner material comprises a material selected from the group consisting of silicon oxide, silicon nitride, silicon oxynitride, SiC, SiCN, a low k dielectric material, a ultra low k dielectric material, and combinations thereof, wherein the conductive fill material comprises a material selected from the group consisting of copper, aluminum, tungsten, silver, gold, doped polysilicon, and combinations thereof. 7. The semiconductor device of claim 1, further comprising a solder ball on the conductive coating and the underfill material. 8. The semiconductor device of claim 1, wherein the underfill material has a first surface substantially coplanar with a first surface of the conductive coating. 9. A semiconductor device comprising: a through substrate via (TSV) comprising a conductive fill material extending through a substrate and a first portion of the TSV extending beyond a first surface of the substrate;an insulating liner surrounding the TSV in the substrate, the insulating liner partially surrounding the first portion of the TSV;a wetting layer on the conductive fill material of the first portion of the TSV; andan underfill material surrounding the first portion of the TSV, a portion of the insulating liner, and the wetting layer, the underfill material contacting a portion of the conductive fill material. 10. The semiconductor device of claim 9, further comprising a solder ball on the wetting layer and the underfill material, wherein the wetting layer comprises a nickel/gold layer. 11. The semiconductor device of claim 9, wherein the insulating liner comprises a material selected from the group consisting of silicon oxide, silicon nitride, silicon oxynitride, SiC, SiCN, a low k dielectric material, a ultra low k dielectric material, and combinations thereof, wherein the conductive fill material comprises a material selected from the group consisting of copper, aluminum, tungsten, silver, gold, doped polysilicon, and combinations thereof. 12. The semiconductor device of claim 9, wherein the insulating liner extends a first height beyond the first surface of the substrate, wherein the first portion extends a second height beyond the first surface of the substrate, the second height being greater than the first height. 13. The semiconductor device of claim 9, wherein the wetting layer does not contact the insulating liner. 14. A semiconductor device comprising: a through substrate via (TSV) comprising a conductive fill material extending through a substrate and a first portion of the TSV extending beyond a first surface of the substrate;an insulating liner surrounding the TSV in the substrate, the insulating liner forming a sidewall spacer on the first portion of the TSV;a wetting layer on the conductive fill material of the first portion of the TSV; andan underfill material surrounding the first portion of the TSV, the underfill material contacting the sidewall spacer, the conductive fill material, and the wetting layer. 15. The semiconductor device of claim 14, wherein the underfill material has a surface substantially coplanar with a surface of the wetting layer. 16. The semiconductor device of claim 15 further comprising a solder ball contacting the first surfaces of the wetting layer and the underfill material. 17. The semiconductor device of claim 14, wherein the conductive fill material further comprises a trench liner, the trench liner contacting a second surface of the wetting layer, the second surface being opposite the first surface. 18. The semiconductor device of claim 14, wherein the conductive fill material further comprises a trench liner, the trench liner being coterminous with the sidewall spacer. 19. The semiconductor device of claim 14, wherein the insulating liner comprises a material selected from the group consisting of silicon oxide, silicon nitride, silicon oxynitride, SiC, SiCN, a low k dielectric material, a ultra low k dielectric material, and combinations thereof, wherein the conductive fill material comprises a material selected from the group consisting of copper, aluminum, tungsten, silver, gold, doped polysilicon, and combinations thereof.