Patent ID: 6756288
Filing Date: 2004-06-29
Classification: H01L,Y10T

Abstract:
A method of dicing a wafer which comprises a plurality of circuit structures, said method comprising the steps of:defining a trench between at least two circuit structures on one face of the wafer; forming the trench down to a defined depth by means of dry etching; fixing to said one face of the wafer a re-detachable intermediate support composed of a fixed intermediate support substrate and an adhesive medium which is applied to said intermediate support substrate and which can specifically be modified in terms of its adhesive strength and which can specifically be modified in terms of its adhesive strength, said adhesive medium being an adhesive foil which is adherent on both sides, the side of the adhesive foil which is secured to said one face of the wafer having the variable adhesive strength, and said adhesive strength being adapted to be reduced by heating or by applying ultra violet radiation; thinning the wafer by dry-etching, which is secured to the intermediate support, from the opposite face so as to obtain individual circuit chips which are held by the intermediate support; and removing the individual circuit chips from the intermediate support by heating said intermediate support or by applying ultra violet radiation to the adhesive foil so as to reduce the adhesive strength of said adhesive foil to such an extent that the circuit chips can be detached from the intermediate support.