Patent ID: 7087502

Claim:
A method for generating chip stacks during the production of chips from wafers, the method comprising: a. providing a first wafer having an active side and a non-active side, wherein the first wafer has a plurality of chips; b. testing the plurality of chips to determine a plurality of functional chips and a plurality of non-functional chips; c. forming grooves on the active side of the first wafer to partially separate the plurality of chips; d. creating adhesive surfaces only on the active sides of the plurality of functional chips; e. positioning the first wafer so that the adhesive surfaces of the first wafer contacts a carrier such that chips having an adhesive surface adhere to the carrier; f. grinding the non-active side of the first wafer down to the grooves to separate the plurality of chips so that the plurality of non-functional chips are not adhered to the carrier; and g. replacing the non-functional chips with functional chips, wherein the function chips have adhesive surfaces which adheres to the carrier.