Chip assembly with a coreless substrate employing a patterned adhesive layer
AssigneeInternational Business Machines Corporation
InventorEdmund Blackshear
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AssigneeInternational Business Machines Corporation
InventorEdmund Blackshear
Estimating the term…
A patterned adhesive layer including holes is employed to attach a coreless substrate layer to a stiffener. The patterned adhesive layer is confined to kerf regions, which are subsequently removed during singulation. Each hole in the patterned adhesive layer has an area that is greater than the area of a bottomside interconnect footprint of the coreless substrate. The patterned adhesive layer may include a permanent adhesive that is thermally curable or ultraviolet-curable. The composition of the stiffener can be tailored so that the thermal coefficient of expansion of the stiffener provides tensile stress to the coreless substrate layer at room temperature and at the bonding temperature. The tensile stress applied to the coreless substrate layer prevents or reduces warpage of the coreless substrate layer during bonding. Upon dicing, bonded stacks of a semiconductor chip and a coreless substrate can be provided without adhesive thereupon.
A method of forming a bonded stack of a coreless substrate and a chip, said method comprising:
A method of forming a bonded stack of a coreless substrate and a chip, said method comprising:
A method of forming a bonded stack of a coreless substrate and a chip, said method comprising:
Dependencies are inferred from the claim text.