Patent ID: 6040204
Filing Date: 2000-03-21
Classification: H01L

Abstract:
A method for manufacturing a first number of chip stacks by stacking a second number of wafers, each of the wafers having a third number of chips, on top of one another, comprising the steps of:(a) applying adhesive material to one side of a first wafer of the second number of wafers;(b) applying adhesive foil to another side of the first wafer;(c) separating the third number of chips of the first wafer, whereby the third number of chips are still connected by the adhesive foil;(d) providing a base arrangement for positioning the adhesive material side of the first wafer on the base arrangement;(e) removing the adhesive foil from the adhesive foil side of the first wafer, whereby the first wafer is adapted to become a mounting wafer;(f) applying adhesive material to one side of a next wafer of the second number of wafers;(g) applying adhesive foil to another side of the next wafer;(h) separating the third number of chips of the next wafer;(i) positioning the adhesive material side of the next wafer on the another side of the mounting wafer;(j) removing the adhesive foil from the adhesive foil side of the next wafer, whereby the next wafer is adapted to become another mounting wafer; and(k) repeating steps (f) through (j) until all of the second number of wafers, each having the third number of separate chips, have been stacked to form the first number of separate chip stacks.