System of components to be hybridized and hybridization process allowing for thermal expansions
First Claim
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1. System of components to be hybridized comprising at least one first component (110) with first hybridization ball reception pads (114a) and with a first coefficient of thermal expansion (α
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1) and at least one second component (112) with second hybridization ball reception pads (114b) and with a second coefficient of thermal expansion (α
2) different from said first coefficient of thermal expansion (α
1), the first and second pads being associated in pairs to form pairs of pads, wherein at a hybridization temperature (Th) the first and second pads (114a, 114b) in each pair of pads are approximately superposable, and at ambient temperature (Ta), the pads (114a, 114b) occupy a position such that when the second component (112) is placed above the first component (110), the first and second pads (114a, 11b) in each pair of pads are mutually offset along a direction connecting the pads in the pair of pads, by a distance compensating a differential expansion of the first and second components (110, 112) between the ambient temperature (Ta) and the hybridization temperature (Th), said differential expansion being due to the difference between said first and second coefficients of thermal expansion.
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Abstract
This invention relates to a system of components to be hybridized including at least one first component (110) with first pads (114a) and with a first coefficient of expansion, and at least one second component (112) with second pads (114b) and with a second coefficient of expansion. According to the invention, at a hybridization temperature Th the pads are approximately superposable, and at an ambient temperature Ta the pads are mutually offset by a distance compensating for the differential expansion of the first and second components.
22 Citations
18 Claims
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1. System of components to be hybridized comprising at least one first component (110) with first hybridization ball reception pads (114a) and with a first coefficient of thermal expansion (α
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1) and at least one second component (112) with second hybridization ball reception pads (114b) and with a second coefficient of thermal expansion (α
2) different from said first coefficient of thermal expansion (α
1), the first and second pads being associated in pairs to form pairs of pads, wherein at a hybridization temperature (Th) the first and second pads (114a, 114b) in each pair of pads are approximately superposable, and at ambient temperature (Ta), the pads (114a, 114b) occupy a position such that when the second component (112) is placed above the first component (110), the first and second pads (114a, 11b) in each pair of pads are mutually offset along a direction connecting the pads in the pair of pads, by a distance compensating a differential expansion of the first and second components (110, 112) between the ambient temperature (Ta) and the hybridization temperature (Th), said differential expansion being due to the difference between said first and second coefficients of thermal expansion. - View Dependent Claims (2, 3, 4, 5, 8)
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1) and at least one second component (112) with second hybridization ball reception pads (114b) and with a second coefficient of thermal expansion (α
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6. Process for preparing at least one first and at least one second component (110, 112) for their hybridization by solder balls (110), the first component (110) comprising first ball reception pads (114a) and with a first coefficient of expansion (α
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1), the second component (112) comprising second ball reception pads (114b) and with a second coefficient of expansion (α
2) different from said first coefficient of expansion (α
1), the first and second pads being associated in pairs respectively to form pairs of pads, comprising the steps of;forming the first and second pads (114a, 11b) on the first and second components at locations such that at hybridization temperature (Th) the first and second pads (114a, 114b) of each pair of pads are approximately superposable, and such that at ambient temperature (Ta), the first and second pads in each pair of pads are mutually offset by a distance to compensate for differential expansion of the first and second components between ambient temperature (Ta) and hybridization temperature (Th), said differential expansion being due to the difference between said first and second coefficients of thermal expansion; and
equipping at least one of the first and second pads with balls made of a meltable material (118). - View Dependent Claims (7, 9)
equipping the first and second components with ball reception pads (114a, 114b) and solder balls (118), in accordance with the preparation process according to claim 6;
placing the first and second components on each other (110, 112);
increasing the temperature of the first and second components (110, 112) and balls (118) to the hybridization temperature (Th) to interconnect the first and second pads (114a, 114b) in each pair of pads, by soldering the balls (118) on these pads; and
cooling the structure thus obtained.
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1), the second component (112) comprising second ball reception pads (114b) and with a second coefficient of expansion (α
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9. Process according to claim 6, further comprising the step of forming one of the first and second components of silicon and the other of said first and second components of a material selected from the group of AsGa and InSb.
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10. System of components to be hybridized comprising at least one component (110) with first hybridization ball reception pads (114a) and with a first coefficient of thermal expansion (α
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1) and at least one second component (112) with second hybridization ball reception pads (114b) and with a second coefficient of thermal expansion (α
2) substantially different from said first coefficient of thermal expansion (α
1), the first and second pads being associated in pairs to form pairs of pads, wherein at a hybridization temperature (Th) the first and second pads (114a, 114b) in each pair of pads are approximately superposable, and at ambient temperature (Ta), the pads (114a, 114b) occupy a position such that when the second component (112) is placed above the first component (110), the first and second pads (114a, 114b) in each pair of pads are mutually offset along a direction connecting the pads in the pair of pads, by a distance compensating a differential expansion of the first and second components (110, 112) between the ambient temperature (Ta) and the hybridization temperature (Th), said differential expansion being due to the difference between said first and second coefficients of thermal expansion. - View Dependent Claims (11, 12, 13, 14, 17)
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1) and at least one second component (112) with second hybridization ball reception pads (114b) and with a second coefficient of thermal expansion (α
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15. Process for preparing at least one first and at least one second component (110, 112) for their hybridization by solder balls (110), the first component (110) comprising first ball reception pads (114a) and with a first coefficient of expansion (α
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1), the second component (112) comprising second ball reception pads (114b) and with a second coefficient of expansion (α
2) substantially different from said first coefficient of expansion (α
1), the first and second pads being associated in pairs respectively to form pairs of pads, comprising the steps of;forming the first and second pads (114a, 11b) on the first and second components at locations such that at hybridization temperature (Th), the first and second pads (114a, 114b) of each pair of pads are approximately superposable, and such that at ambient temperature (Ta), the first and second pads in each pair of pads are mutually offset by a distance to compensate for differential expansion of the first and second components between ambient temperature (Ta) and hybridization temperature (Th), said differential expansion being due to the difference between said first and second coefficients of thermal expansion; and
equipping at least one of the first and second pads with balls made of a meltable material (118). - View Dependent Claims (16, 18)
equipping the first and second components with ball reception pads (114a, 114b) and solder balls (118), in accordance with the preparation process according to claim 15;
placing the first and second components on each other (110, 112);
increasing the temperature of the first and second components (110, 112) and balls (118) to the hybridization temperature (Th) to interconnect the first and second pads (114a, 114b) in each pair of pads, by soldering the balls (118) on these pads; and
cooling the structure thus obtained.
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1), the second component (112) comprising second ball reception pads (114b) and with a second coefficient of expansion (α
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18. Process according to claim 15, further comprising the step of forming one of the first and second components of silicon and the other of said first and second components of a material selected from the group of AsGa and InSb.
Specification