Ceramic packaging method employing flip-chip bonding
View Patent ↗In a ceramic packaging method employing a flip-chip bonding, a gold bump is formed on a chip bond pad in a wafer and the wafer is divided into a plurality of chips by a die sawing. A Cu pattern and the gold bump are aligned on a ceramic package, thereby adhering a bottom chip to the ceramic package through the Cu pattern and the gold bump and a top chip is adhered to the bottom chip by using an adhesive, thereby forming a bottom/top chip structure of the bottom and top chip. The chip bond pad is electrically connected to the bottom chip and the top chip by interconnecting the bottom and the top chips and interconnected portions of the bottom and the top chips are encapsulated.
1. A ceramic packaging method employing a flip-chip bonding, comprising the steps of:
(a) forming a gold bump on a chip bond pad in a wafer;
(b) dividing the wafer into a plurality of chips by a die sawing;
(c) aligning a Cu pattern and the gold bump on a ceramic package and adhering a bottom chip to the ceramic package through the Cu pattern and the gold bump;
(d) adhering a top chip to the bottom chip by using an adhesive, thereby forming a bottom/top chip structure of the bottom and top chip;
(e) electrically connecting the chip bond pad to the bottom chip and the chip bond pad to the top chip by interconnecting the bottom and the top chips; and
(f) encapsulating interconnected portions of the bottom and the top chips.
2. The method of claim 1 , wherein a heat emitter is installed on a bottom portion of the ceramic package in order to emit heat generated from the bottom and the top chip.
3. The method of claim 1 , wherein a groove is formed on the Cu pattern so that the gold bump is safely attached thereto.
4. The method of claim 1 , wherein the adhesive is an epoxy or a polymide tape.
5. The method of claim 1 , wherein a flip-chip bonding is carried out with respect to the top chip.
6. The method of claim 1 , wherein the bottom and the top chip are electrically interconnected to each other by the Cu pattern.
7. The method of claim 1 , wherein the interconnected portions are encapsulated by an epoxy resin.