Patent ID: 8361828

Claim:
A method for dicing semiconductor devices, comprising: providing a holder supporting a semiconductor film backed by a metal layer having a back surface bonded to a front surface of a substrate by an adhesive layer, the film having semiconductor devices thereupon and having an exposed front surface with reference features defining real or virtual device boundaries, and the flexible substrate having an exposed back surface; directing an ultraviolet laser beam of a first wavelength to cut from the front surface of the film through the semiconductor film, through the metal layer and partially into the adhesive layer such that a majority of a thickness of the adhesive layer remains intact; moving the semiconductor film and the ultraviolet laser beam relative to each other to cut using the device boundaries from the front surface of the film to form a first trough; mapping the real or virtual device boundaries from the front surface of the semiconductor film to corresponding mapped real or virtual device boundaries on the back surface of the flexible substrate; directing an infrared laser beam of a second wavelength to cut from the back surface of the flexible substrate through the flexible substrate and through the majority of the thickness of the adhesive layer; and moving the semiconductor film and the infrared laser beam relative to each other to cut using the mapped device boundaries from the back surface of the flexible substrate and form a second trough using the mapped device boundaries meeting or overlapping the first trough thereby separating a one of the semiconductor devices from another of the semiconductor devices.