Method of wire bonding over active area of a semiconductor circuit
First Claim
1. An integrated circuit die comprising:
- a semiconductor substrate;
a dielectric layer over said semiconductor substrate;
a metallization structure over said dielectric layer;
a passivation layer over said dielectric layer and over said metallization structure, wherein said passivation layer comprises a nitride, wherein a first opening in said passivation layer is over a first contact point of said metallization structure, and said first contact point is at a bottom of said first opening;
a polymer structure on said passivation layer, wherein said polymer structure is not vertically over said first contact point, wherein said polymer structure has a top, a first sidewall and a second sidewall opposite to said first sidewall, wherein said top is between said first and second sidewalls; and
a metal layer on said top, on said first and second sidewalls and on said first contact point, wherein said metal layer comprises a first portion on said first sidewall, a second portion on said second sidewall and a third portion on said top, wherein said third portion of said metal layer has a bonding contact area vertically over said top, wherein said bonding contact area is connected to said first contact point through said first opening, wherein said first portion of said metal layer is connected to said second portion of said metal layer through said third portion of said metal layer, wherein said metal layer comprises a titanium-containing layer and a first gold layer directly on said titanium-containing layer, wherein no polymer layer is on said metal layer.
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Accused Products
Abstract
A method and structure are provided to enable wire bond connections over active and/or passive devices and/or low-k dielectrics, formed on an Integrated Circuit die. A semiconductor substrate having active and/or passive devices is provided, with interconnect metallization formed over the active and/or passive devices. A passivation layer formed over the interconnect metallization is provided, wherein openings are formed in the passivation layer to an upper metal layer of the interconnect metallization. Compliant metal bond pads are formed over the passivation layer, wherein the compliant metal bond pads are connected through the openings to the upper metal layer, and wherein the compliant metal bond pads are formed substantially over the active and/or passive devices. The compliant metal bond pads may be formed of a composite metal structure.
428 Citations
74 Claims
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1. An integrated circuit die comprising:
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a semiconductor substrate; a dielectric layer over said semiconductor substrate; a metallization structure over said dielectric layer; a passivation layer over said dielectric layer and over said metallization structure, wherein said passivation layer comprises a nitride, wherein a first opening in said passivation layer is over a first contact point of said metallization structure, and said first contact point is at a bottom of said first opening; a polymer structure on said passivation layer, wherein said polymer structure is not vertically over said first contact point, wherein said polymer structure has a top, a first sidewall and a second sidewall opposite to said first sidewall, wherein said top is between said first and second sidewalls; and a metal layer on said top, on said first and second sidewalls and on said first contact point, wherein said metal layer comprises a first portion on said first sidewall, a second portion on said second sidewall and a third portion on said top, wherein said third portion of said metal layer has a bonding contact area vertically over said top, wherein said bonding contact area is connected to said first contact point through said first opening, wherein said first portion of said metal layer is connected to said second portion of said metal layer through said third portion of said metal layer, wherein said metal layer comprises a titanium-containing layer and a first gold layer directly on said titanium-containing layer, wherein no polymer layer is on said metal layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An integrated circuit die comprising:
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a semiconductor substrate; a dielectric layer over said semiconductor substrate; a metallization structure over said dielectric layer; a passivation layer over said dielectric layer and over said metallization structure, wherein said passivation layer comprises a nitride, wherein a first opening in said passivation layer is over a first contact point of said metallization structure, and said first contact point is at a bottom of said first opening; a polymer structure on said passivation layer, wherein said polymer structure has a top, a first sidewall and a second sidewall opposite to said first sidewall, wherein said top is between said first and second sidewalls; and a metal layer on said top, on said first and second sidewalls and on said first contact point, wherein said metal layer comprises a first portion on said first sidewall, a second portion on said second sidewall and a third portion on said top, wherein said third portion of said metal layer has a bonding contact area vertically over said top, wherein said bonding contact area is connected to said first contact point through said first opening, wherein said first portion of said metal layer is connected to said second portion of said metal layer through said third portion of said metal layer, wherein said metal layer comprises a first gold layer and a second gold layer directly on said first gold layer. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 50, 51, 52, 53)
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35. An integrated circuit die comprising:
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a semiconductor substrate; a dielectric layer over said semiconductor substrate; a metallization structure over said dielectric layer; a passivation layer over said dielectric layer and over said metallization structure, wherein said passivation layer comprises a nitride, wherein a first opening in said passivation layer is over a first contact point of said metallization structure, and said first contact point is at a bottom of said first opening, and wherein a second opening in said passivation layer is over a second contact point of said metallization structure, and said second contact point is at a bottom of said second opening; a polymer structure on said passivation layer, wherein said polymer structure has a top, a first sidewall and a second sidewall opposite to said first sidewall, wherein said top is between said first and second sidewalls; and a metal layer on said top, on said first and second sidewalls and on said first and second contact points, wherein said metal layer has a bonding contact area vertically over said top, wherein said bonding contact area is connected to said first contact point through said first opening, and wherein said bonding contact area is connected to said second contact point through said second opening, wherein said first contact point is connected to said second contact point through said metal layer, wherein said metal layer comprises a titanium-containing layer, a gold seed layer on said titanium-containing layer, and an electroplated gold layer on said gold seed layer. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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54. An integrated circuit die comprising:
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a semiconductor substrate; a dielectric layer over said semiconductor substrate; a metallization structure over said dielectric layer; a passivation layer over said dielectric layer and over said metallization structure, wherein said passivation layer comprises a nitride, wherein a first opening in said passivation layer is over a first contact point of said metallization structure, and said first contact point is at a bottom of said first opening; a polymer structure on a first region of a top surface of said passivation layer, wherein said polymer structure has a top, a first sidewall and a second sidewall opposite to said first sidewall, wherein said top is between said first and second sidewalls and is not vertically over said first contact point; and a metal layer on said top, on said first and second sidewalls, on said first contact point and on a second region of said top surface of said passivation layer, wherein said second region is between said first region and said first opening, wherein said metal layer comprises a first portion on said first sidewall, a second portion on said second sidewall and a third portion on said top, wherein said third portion of said metal layer has a bonding contact area vertically over said top, wherein said bonding contact area is connected to said first contact point through said first opening, wherein said first portion of said metal layer is connected to said second portion of said metal layer through said third portion of said metal layer, wherein said metal layer comprises a glue layer and a gold layer over said glue layer, wherein no polymer layer is on said metal layer. - View Dependent Claims (55, 56, 57, 58, 59, 60, 61)
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62. An integrated circuit die comprising:
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a semiconductor substrate; a dielectric layer over said semiconductor substrate; a first metal interconnect over said dielectric layer; a passivation layer over said dielectric layer and over said first metal interconnect, wherein a first opening in said passivation layer is over a first contact point of said first metal interconnect, and said first contact point is at a bottom of said first opening; a polymer structure on a first region of a top surface of said passivation layer, wherein said polymer structure has a right slope surface and a left slope surface opposite to said right slope surface; and a metal layer on said right and left slope surfaces, on said first contact point and on a second region of said top surface of said passivation layer, wherein said second region is between said first region and said first opening, wherein said metal layer is connected to said first contact point through said first opening, wherein said metal layer comprises a first portion on said right slope surface and a second portion on said left slope surface, wherein said first portion of said metal layer is connected to said second portion of said metal layer, wherein said metal layer has a bonding contact area vertically over a portion of said polymer structure between said right and left slope surfaces, wherein said bonding contact area is connected to said first contact point through said second portion of said metal layer, wherein said metal layer comprises a glue layer and a gold layer over said glue layer. - View Dependent Claims (63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74)
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Specification