Method for forming a bond pad interface
First Claim
1. A method of forming a semiconductor device comprising:
- forming a conductive bond pad over a semiconductor substrate, the conductive bond pad including a plurality of dielectric studs;
forming a dielectric layer over the conductive bond pad;
removing portions of the dielectric layer, wherein the removing portions of the dielectric layer forms a plurality of support structures that over lie the conductive bond pad, wherein the plurality of support structures are interconnected with unremoved portions of the dielectric layer;
forming a conductive capping layer overlying the plurality of support structures, wherein the conductive capping layer electrically contacts a portion of the conductive bond pad.
20 Assignments
0 Petitions
Accused Products
Abstract
A composite bond pad that is resistant to external forces that may be applied during probing or packaging operations is presented. The composite bond pad includes a non-self-passivating conductive bond pad (134) that is formed over a semiconductor substrate (100). A dielectric layer (136) is then formed over the conductive bond pad (134). Portions of the dielectric layer (136) are removed such that the dielectric layer (136) becomes perforated and a portion of the conductive bond pad (134) is exposed. Remaining portions of the dielectric layer (136) form support structures (138) that overlie that bond pad. A self-passivating conductive capping layer (204) is then formed overlying the bond pad structure, where the perforations in the dielectric layer (136) allow for electrical contact between the capping layer (204) and the exposed portions of the underlying bond pad (134). The support structures (138) provide a mechanical barrier that protects the interface between the capping layer (204) and the bond pad (134). Additional mechanical robustness is achieved when the support structures (138) remain coupled to the unremoved portion of the dielectric layer (136), as forces buffered by the support structures (138) are distributed across the dielectric layer (136) and not concentrated at the bond pad location.
35 Citations
33 Claims
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1. A method of forming a semiconductor device comprising:
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forming a conductive bond pad over a semiconductor substrate, the conductive bond pad including a plurality of dielectric studs; forming a dielectric layer over the conductive bond pad; removing portions of the dielectric layer, wherein the removing portions of the dielectric layer forms a plurality of support structures that over lie the conductive bond pad, wherein the plurality of support structures are interconnected with unremoved portions of the dielectric layer; forming a conductive capping layer overlying the plurality of support structures, wherein the conductive capping layer electrically contacts a portion of the conductive bond pad. - View Dependent Claims (2, 3, 4)
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5. A method of forming a semiconductor device, the method comprising:
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forming a conductive bond pad over a semiconductor substrate, the conductive bond pad including a plurality of dielectric studs; forming a dielectric layer over the conductive bond pad; removing portions of the dielectric layer, wherein the removing portions of the dielectric layer forms a plurality of support structures that overlie the conductive bond pad; forming a barrier layer overlying the conductive bond pad, the barrier layer electrically contacts the bond pad; forming a conductive capping layer overlying the plurality of support structures and overlying the barrier layer; wherein the removing portions of the dielectric layer defines a plurality of openings in the dielectric layer; wherein a portion of the barrier layer is located in each opening of the plurality; wherein a portion of the conductive capping layer is located in each opening of the plurality of openings. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of forming a semiconductor device, comprising:
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forming a conductive bond pad over a semiconductor substrate, the conductive bond pad including a plurality of dielectric studs; forming a dielectric layer over the conductive bond pad; removing portions of the dielectric layer, wherein the removing portions of the dielectric layer forms a plurality of support structures that over lie the conductive bond pad, wherein each stud of the plurality is positioned beneath a support structure of the plurality; forming a conductive capping layer overlying the plurality of support structures; wherein for each support structure of the plurality, there is no conductive material between a support structure of the plurality and dielectric studs of the plurality positioned beneath the support structure. - View Dependent Claims (15, 16, 17)
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18. A method of forming a semiconductor device, comprising:
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forming a conductive bond pad over a semiconductor substrate, the conductive bond pad including a plurality of dielectric studs; forming a dielectric layer over the conductive bond pad; removing portions of the dielectric layer, wherein the removing portions of the dielectric layer forms a plurality of support structures that over lie the conductive bond pad, wherein each stud of the plurality is positioned beneath a support structure of the plurality; forming a conductive capping layer overlying the plurality of support structures; forming a barrier layer after the removing portions of the dielectric layer, wherein the capping layer overlies the barrier layer. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A method of forming a semiconductor device comprising:
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forming a conductive bond pad over a substrate, the conductive bond pad including a plurality of dielectric studs; forming a dielectric layer over the conductive bond pad; removing portions of the dielectric layer to define a plurality of openings in the dielectric layer over the conductive bond pad; forming a baffler layer over the dielectric layer, wherein a portion of the barrier layer is located in each of the plurality of openings; forming a conductive capping layer over the barrier layer, wherein a portion of the conductive capping layer is located in each of the plurality of openings. - View Dependent Claims (25, 26, 27, 28)
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29. A method of forming a semiconductor device comprising:
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forming a conductive bond pad over a substrate, the conductive bond pad including a plurality of dielectric studs; forming a dielectric layer over the conductive bond pad; removing portions of the dielectric layer to define a plurality of openings in the dielectric layer over the conductive bond pad, wherein none of the plurality of openings is located over a dielectric stud of the plurality; forming a conductive capping layer over the dielectric layer after the removing portions of the dielectric layer. - View Dependent Claims (30, 31, 32, 33)
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Specification