Patent ID: 7253078
Filing Date: 2007-08-07
Classification: H01L

Abstract:
1. A method, comprising: fabricating a plurality of integrated circuit dice on an active surface of a wafer; fabricating one or more electrically conductive pads on each of the dice on the active surface of the wafer respectively; forming solder bumps on the one or more electrically conductive pads on each of the dice on the active surface of the wafer respectively; applying a layer of underfill adhesive on the active surface of the wafer, the layer of underfill covering the plurality of integrated circuit dice on the active surface of the wafer; and partially curing the layer of underfill adhesive applied to the active surface of the wafer, wherein the curing the underfill adhesive after depositing the underfill involves only partially curing the underfill adhesive without fully curing the underfill adhesive so that the underfill adhesive may be further cured when the associated solder bumps are reflowed to electrically connect the integrated circuit dice to substrates respectively wherein the underfill adhesive includes at least once of the following properties: a specificity of gravity ranging from 1.0 to 1.2; a solvent content ranging from 20% to 40% a cure time of 20 to 30 minutes at 100 to 130 degrees C.; and a filler content of 1% to 10% by weight.