Patent ID: 7135385
Filing Date: 2006-11-14
Classification: H01L

Abstract:
1. A wafer level method of forming an optically opaque backcoat layer on back surfaces of integrated circuit devices, the method comprising: providing a wafer having a plurality of integrated circuit devices, the wafer having a first surface and a second surface, the first surface having a plurality of electrically conductive pads, the second surface substantially parallel and opposite the first surface; applying a backcoat/mount tape on the second surface of the wafer wherein the backcoat/mount tape includes a backcoat adhesive layer and a mount layer, the backcoat adhesive layer being formed from an optically opaque material; and curing the backcoat adhesive layer of the backcoat/mount tape such that the backcoat adhesive layer is permanently affixed to the second surface of the wafer and such that the backcoat adhesive layer covers the entire back surface of each of the integrated circuit devices thereby forming a backcoat layer on the second surface of the wafer that is formed only from the backcoat adhesive layer; dicing the wafer to define a multiplicity of singulated integrated circuits dice; and separating the singulated integrated circuits dice from the mount layer of the backcoat/mount tape while leaving only the backcoat layer formed from the backcoat adhesive layer affixed to the back surfaces of the integrated circuit dice, wherein the backcoat adhesive layer is cured before the mount layer is removed, whereby the cured backcoat layer forms an optically opaque protective coating that covers the entire back surface of the integrated circuit device and is suitable for preventing light from striking the back surface of the integrated circuit device.