Patent ID: 7244636
Filing Date: 2007-07-17
Classification: H01L

Abstract:
1. A method for fabricating a semiconductor device comprising the steps of: providing an insulating substrate having first and second surfaces; placing the second substrate surface on a chuck with openings for vacuum suction, the surface of the chuck being effectively convex; activating the vacuum suction so that the substrate is bent conformal with the effectively convex chuck surface; placing adhesive material on the first substrate surface, the material being viscous and having a thickness; providing a semiconductor chip having sides, one of the sides intended for mechanical attachment; placing the attachment chip side on the adhesive material, whereby the thickness of the material becomes distributed so that the thickness under the central chip area is smaller than or equal to the material thickness under the peripheral chip areas; the position of the chip defining a plane; de-activating the vacuum suction and removing the substrate together with the assembled chip from the chuck; embedding all remaining chip surfaces and the portions of the first substrate surface not involved in the chip attachment in thermoset encapsulation compound; and polymerizing the compound, causing volumetric compound shrinkage, thereby pulling the substrate into a position substantially coplanar with the chip and rendering the thickness distribution of the adhesive material so that the thickness under the central chip area is equal to or smaller than the material thickness under the peripheral chip areas.