Composite bump structures
First Claim
1. A composite bump structure, comprising:
- an integrated circuit element;
input/output pads formed on said integrated circuit element, wherein each of said input/output pads has an outer perimeter;
base metal pads formed on said input/output pads; and
composite bumps formed on said base metal pads, wherein said composite bumps comprise a polymer body covered by a conductive metal coating, wherein said polymer body has a Young'"'"'s Modulus between about 0.4×
10-6 and 0.5×
10-6 psi.
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Accused Products
Abstract
A composite bump structure and methods of forming the composite bump structure. The composite bump structure comprises a polymer body of relatively low Young'"'"'s Modulus compared to metals covered by a conductive metal coating formed at the input/output pads of an integrated circuit element or substrate. The composite bump is formed using material deposition, lithography, and etching techniques. A layer of soldering metal can be formed on the composite bumps if this is desired for subsequent processing. A base metal pad covering the integrated circuit element input/output pad can be used to provide added flexibility in location of the composite bump. The composite bump can be formed directly on the input/output pad or on the base metal pad.
98 Citations
21 Claims
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1. A composite bump structure, comprising:
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an integrated circuit element; input/output pads formed on said integrated circuit element, wherein each of said input/output pads has an outer perimeter; base metal pads formed on said input/output pads; and composite bumps formed on said base metal pads, wherein said composite bumps comprise a polymer body covered by a conductive metal coating, wherein said polymer body has a Young'"'"'s Modulus between about 0.4×
10-6 and 0.5×
10-6 psi. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A composite bump structure, comprising:
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an integrated circuit element with input/output pads; a passivation layer covering said integrated circuit element having contact holes over said input/output pads; base metal pads formed on said passivation layer covering said contact holes and making electrical contact with said input/output pads; and composite bumps formed on said base metal pads, wherein said composite bumps comprise a polymer body covered by a conductive metal coating, wherein said polymer body has a Young'"'"'s Modulus between about 0.4×
10-6 and 0.5×
10-6 psi. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A composite bump structure, comprising:
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an integrated circuit element; input/output pads formed on said integrated circuit element, wherein each of said input/output pads has an outer periphery; and multiple composite bumps formed wherein each said composite bump is formed from a polymer body having a Young'"'"'s Modulus between about 0.4×
10-6 and 0.5×
10-6 psi covered by a conductive metal coating and said multiple composite bumps are located inside said outer periphery of each said input/output pad.
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20. A composite bump structure, comprising:
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an integrated circuit element; input/output pads formed on said integrated circuit element, wherein each of said input/output pads has an outer periphery; and multiple composite bumps formed wherein each said composite bump is formed from a polymer body having a Young'"'"'s Modulus between about 0.4×
10-6 and 0.5×
10-6 psi covered by a conductive metal coating and said multiple composite bumps are located in a ring surrounding said outer periphery of each said input/output pad.
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21. A composite bump structure, comprising:
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an integrated circuit element; input/output pads formed on said integrated circuit element, wherein each of said input/output pads has an outer periphery; and multiple composite bumps formed wherein each said composite bump is formed from a polymer body having a Young'"'"'s Modulus between about 0.4×
10-6 and 0.5×
10-6 psi covered by a conductive metal coating and said multiple composite bumps are located inside said outer periphery of each said input/output pad and in a ring surrounding said outer periphery of each said input/output pad.
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Specification