Patent ID: 6617674
Filing Date: 2003-09-09
Classification: G03F,H01L

Abstract:
A semiconductor package comprising:a semiconductor wafer having an active surface comprising a plurality of bond pads; and a cured silicone layer covering the active surface of the wafer except the bond pads, wherein the silicone layer is prepared by a method comprising the steps of: (i) applying a silicone composition to the active surface of the semiconductor wafer to form a film, wherein the active surface comprises a plurality of bond pads, and the silicone composition comprises: (A) an organopolysiloxane containing an average of at least two silicon-bonded alkenyl groups per molecule, (B) an organosilicon compound containing an average of at least two silicon-bonded hydrogen atoms per molecule in a concentration sufficient to cure the composition, and (C) a catalytic amount of a photoactivated hydrosilylation catalyst; (ii) exposing a portion of the film to radiation having a wavelength of from 150 to 800 nm to produce a partially exposed film having non-exposed regions covering at least a portion of each bond pad and exposed regions covering the remainder of the active surface; (iii) heating the partially exposed film for an amount of time such that the exposed regions are substantially insoluble in a developing solvent and the non-exposed regions are soluble in the developing solvent; (iv) removing the non-exposed regions of the heated film with the developing solvent to form a patterned film; and (v) heating the patterned film for an amount of time sufficient to form the cured silicone layer.