Patent ID: 7354802
Filing Date: 2008-04-08
Classification: H01L,Y10T

Abstract:
1. A wafer level method of placing an adhesive layer on the back surface of integrated circuit devices using a mounting tape, the method comprising: (a) adhering a wafer to a mounting tape having a B-stageable adhesive layer, an expandable thermal release layer and a base layer; (b) dicing the wafer while the wafer is attached to the mounting tape, wherein the dicing is arranged to cut entirely through the adhesive layer but not fully through the base layer; (c) heating a selected portion of the mount tape in a region under a selected die formed in the wafer, wherein the selected portion of the mount tape is heated to a temperature sufficient to release the thermal release layer and to cause the thermal release layer to lift the selected die relative to at least one adjacent die in the wafer and wherein the portion of the B-stageable adhesive associated with the selected die remains adhered to the selected die; (d) picking the selected die from the wafer; (e) repeating steps (c) and (d) for different selected dice to facilitate sequential releasing and picking of the selected dice; (f) whereby the released dice have a B-stageable adhesive layer on their back surface that may be used as a die attach adhesive to attach the respective dice to associated substrates.