Flip chip interconnection structure
First Claim
1. A method for forming a flip chip interconnection structure, comprising providing a first member on an IC chip and a second member on a substrate, the first member comprising a deformable material having a low yield strength and a high elongation to failure and the second member having surface asperities on a surface on a part of the second member to be bonded with the first member;
- and bringing the first member into contact with the surface on the second member and pressing the first and second members against one another using a force sufficient to cause plastic flow of part of the first member into the surface asperities on the second member.
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0 Petitions
Accused Products
Abstract
A flip chip interconnection structure is formed by mechanically interlocking joining surfaces of a first and second element. The first element, which may be a bump on an integrated circuit chip, includes a soft, deformable material with a low yield strength and high elongation to failure. The surface of the second element, which may for example be a substrate pad, is provided with asperities into which the first element deforms plastically under pressure to form the mechanical interlock.
56 Citations
35 Claims
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1. A method for forming a flip chip interconnection structure, comprising
providing a first member on an IC chip and a second member on a substrate, the first member comprising a deformable material having a low yield strength and a high elongation to failure and the second member having surface asperities on a surface on a part of the second member to be bonded with the first member; - and
bringing the first member into contact with the surface on the second member and pressing the first and second members against one another using a force sufficient to cause plastic flow of part of the first member into the surface asperities on the second member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 18, 19, 20, 21)
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10-17. -17. (canceled)
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22. A method for forming a flip chip interconnection structure, comprising
providing a first member on an IC chip and a second member on a substrate, the first member comprising a deformable material having a low yield strength and a high elongation to failure and the second member having a surface adjacent an edge on a part of the second member to be bonded with the first member; - and
bringing the first member into contact with the second member surface and pressing the first and second members against one another using a force sufficient to cause plastic flow of part of the first member around the edge. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification