Three-dimensional integrated circuits with protection layers
First Claim
Patent Images
1. A method comprising:
- providing a wafer comprising a first die and a second die, each comprising a first bonding pad on a top surface of the corresponding first and second dies;
providing a third die and a fourth die each comprising a first surface and a second surface opposite the first surface;
stacking the third die on the first die, and the fourth die on the second die, wherein a second bonding pad on the first surface of each of the third and the fourth dies is bonded to the first bonding pad of the first die through flip-chip bonding, and wherein the third die and the fourth die have a gap therebetween;
forming a protection layer comprising vertical portions on sidewalls of the third and the fourth dies, and a horizontal portion directly over the first die and the second die; and
forming a coating on the protection layer and filling a remaining space of the space between the third and the fourth dies.
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Abstract
A semiconductor structure includes a first die comprising a first substrate and a first bonding pad over the first substrate, a second die having a first surface and a second surface opposite the first surface, wherein the second die is stacked on the first die and a protection layer having a vertical portion on a sidewall of the second die, and a horizontal portion extending over the first die.
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Citations
19 Claims
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1. A method comprising:
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providing a wafer comprising a first die and a second die, each comprising a first bonding pad on a top surface of the corresponding first and second dies; providing a third die and a fourth die each comprising a first surface and a second surface opposite the first surface; stacking the third die on the first die, and the fourth die on the second die, wherein a second bonding pad on the first surface of each of the third and the fourth dies is bonded to the first bonding pad of the first die through flip-chip bonding, and wherein the third die and the fourth die have a gap therebetween; forming a protection layer comprising vertical portions on sidewalls of the third and the fourth dies, and a horizontal portion directly over the first die and the second die; and forming a coating on the protection layer and filling a remaining space of the space between the third and the fourth dies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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providing a wafer comprising a first die and a second die; stacking a third die to the first die through flip-chip bonding, wherein a first gap is formed between the first die and the third die; stacking a fourth die to the second die through flip-chip bonding, wherein a second gap is formed between the second die and the fourth die; forming a protection layer on top surfaces of, and extending on sidewalls of, the third and the fourth dies, wherein the protection layer seals the first and the second gaps from aside; filling a coating on the protection layer and filling an entirety of the space between the third and the fourth dies; and performing a polish to remove portions of the protection layer directly over the top surfaces of the third and the fourth dies, until a top portion of each of the third and the fourth dies are removed. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method comprising:
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providing a wafer comprising a first die and a second die, each comprising; a first substrate; and a first bonding over the first substrate; forming a third die and a fourth die comprising; providing a second substrate; forming a deep dielectric plug in the second substrate; forming an interconnect structure physically connected to the deep dielectric plug; and forming a second bonding pad over, and electrically coupled to, the interconnect structure; stacking the first die to the third die with the first bonding pad of the first die bonded to the second bonding pad of the third die; stacking the second die to the fourth die with the first bonding pad of the second die bonded to the second bonding pad of the fourth die; forming a protection layer, wherein the protection layer comprises vertical portions on sidewalls of the third and the fourth dies, and horizontal portions directly over the first and the second dies; forming a coating on the protection layer and filling a remaining portion of the space horizontally between the third and the fourth dies; polishing the coating, the protection layer, and the second substrates of the third and the fourth dies to expose the deep dielectric plugs; replacing the deep dielectric plugs of the third and the fourth dies with a conductive material to form through-silicon vias; and forming contact pads electrically coupled to the through-silicon vias. - View Dependent Claims (18, 19)
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Specification