PRE-PROCESSING TO REDUCE WAFER LEVEL WARPAGE
First Claim
1. A method for packaging a stacked integrated circuit, the method comprising:
- attaching a carrier wafer to a first tier wafer;
coupling a plurality of second tier dies to the first tier wafer to form a group of stacked integrated circuits after attaching the carrier wafer to the first tier wafer;
applying a mold compound to the plurality of second tier dies coupled to the first tier wafer after coupling the plurality of second tier dies to the first tier wafer,pre-processing the group of stacked integrated circuits; and
releasing the first tier wafer from the carrier wafer after pre-processing the group of stacked integrated circuits.
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Accused Products
Abstract
A method for packaging a stacked integrated circuit (IC) includes pre-processing the stacked IC before releasing the stacked IC from the carrier wafer. Pre-processing reduces wafer warpage and simplifies the packaging process by dicing materials separately. Pre-processing may be performed on the first tier wafer of a stacked IC during manufacturing to partially or completely dice the first tier wafer into first tier dies before release from the carrier wafer. Pre-processing may also be performed by laser cutting the mold compound surrounding the first tier wafer and second tier dies before releasing the stacked IC from the carrier wafer. Openings in the first tier wafer and/or mold compound allows balancing of stresses in the packaging process and reduction of wafer warpage.
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Citations
20 Claims
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1. A method for packaging a stacked integrated circuit, the method comprising:
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attaching a carrier wafer to a first tier wafer; coupling a plurality of second tier dies to the first tier wafer to form a group of stacked integrated circuits after attaching the carrier wafer to the first tier wafer; applying a mold compound to the plurality of second tier dies coupled to the first tier wafer after coupling the plurality of second tier dies to the first tier wafer, pre-processing the group of stacked integrated circuits; and releasing the first tier wafer from the carrier wafer after pre-processing the group of stacked integrated circuits. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An integrated circuit, comprising:
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a plurality of first tier dies stacked on a carrier wafer, the plurality of first tier dies at least partially separated; a plurality of second tier dies stacked on the plurality of first tier dies; and a mold compound surrounding the plurality of first tier dies and surrounding the plurality of second tier dies, the mold compound filling spaces between the plurality of first tier dies. - View Dependent Claims (13, 14)
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15. A method for packaging a stacked integrated circuit, the method comprising the steps of:
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attaching a carrier wafer to a first tier wafer; coupling a plurality of second tier dies to the first tier wafer to form a group of stacked integrated circuits after attaching the carrier wafer to the first tier wafer; pre-processing the group of stacked integrated circuits; and releasing the first tier wafer from the carrier wafer after pre-processing the group of stacked integrated circuits. - View Dependent Claims (16)
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17. A stacked integrated circuit manufactured by a process, comprising:
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attaching a carrier wafer to a first tier wafer; coupling a plurality of second tier dies to the first tier wafer to form a group of stacked integrated circuits after attaching the carrier wafer to the first tier wafer; pre-processing the group of stacked integrated circuits; and releasing the first tier wafer from the carrier wafer after pre-processing the group of stacked integrated circuits. - View Dependent Claims (18)
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19. An integrated circuit, comprising:
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a first tier wafer stacked on a carrier wafer, the first tier wafer including means for separating the first tier wafer into a plurality of first tier dies; a plurality of second tier dies stacked on the first tier wafer; and a mold compound surrounding the plurality of first tier dies and surrounding the plurality of second tier dies, the mold compound filling the separating means. - View Dependent Claims (20)
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Specification