Manufacturing method for semiconductor integrated device
View Patent ↗In a chip pick-up process after dicing in an assembly process during manufacture of a semiconductor integrated circuit device it is an important subject to diminish a pick-up defect caused by the reduction in thickness of each chip which is proceeding in quick tempo. Particularly, bending of the chip peripheral portion caused by a peeling operation is very likely to induce cracking and chipping of the chip. In the present invention, to solve these problems, in case of peeling a chip from a dicing tape (adhesive tape) or the like while vacuum-chucking the chip by a chucking collet, the flow rate of a vacuum chucking system in the chucking collet is monitored to check a bent state of the chip before complete separation of the first chip from the adhesive tape.
1. A method for manufacturing a semiconductor integrated circuit device, comprising the steps of:
(a) supplying a plurality of chips divided in individual chip regions while being arranged substantially in their original two-dimensional layout upon a wafer, to a chip treating apparatus with their back surfaces fixed to an adhesive tape; and
(b) vacuum-chucking a surface of a first chip out of the chips with a chucking collet and peeling the adhesive tape from the back surface of the first chip in a state in which the adhesive tape over the back surface of the first chip is vacuum-chucked to an upper surface of a lower base,
the step (b) comprising the following sub-steps of:
(b1) monitoring a bent state of the first chip before complete separation of the first chip from the adhesive tape by measuring the flow rate of a vacuum chucking system of the chucking collet;
(b2) raising a stick-up block as a principal portion of the lower base together with the chucking collet; and
(b3) determining an optimum rise height of the stick-up block on the basis of the monitor information obtained in the sub-step (b1),
the method further comprising a following step of:
(c) after the step (b), vacuum-chucking a surface of a second chip out of the chips with the chucking collet and raising the stick-up block by only a distance corresponding to the optimum rise height in a state in which the adhesive tape over the back surface of the second chip is vacuum-chucked to the upper surface of the lower base.
2. A method according to claim 1 , wherein the first chip is a product chip.
3. A method according to claim 1 , wherein the second chip is a product chip.
4. A method according to claim 1 , wherein an adhesive layer for die bonding is formed beforehand over each of the back surfaces of the first and second chips.