Patent ID: 7605054
Filing Date: 2009-10-20
Classification: H01L

Abstract:
1. A method for forming a device wafer with a recyclable support comprising: providing a wafer having first and second surfaces, with at least the first surface of the wafer comprising a semiconductor material that is suitable for receiving or forming electronic devices thereon; providing a supporting substrate having upper and lower surfaces; selecting the wafer and supporting substrates to have thicknesses to provide the construct thickness to be about 650 to 1000 microns, with constructs that have a diameter of 200 mm having a minimum thickness of approximately 725 μm, constructs that have a diameter of 300 mm having a minimum thickness of approximately 775 μm, and constructs that have a diameter of 450 mm having a minimum thickness of approximately 800 μm; providing the second surface of the wafer or the upper surface of the supporting substrate with void features in an amount sufficient to enable a connecting bond to form at an interface between the wafer and the substrate; forming the connecting bond at the interface between the second surface of the wafer and the upper surface of the supporting substrate to form a construct, wherein the connecting bond is suitable to maintain the wafer and supporting substrate in association while forming or applying electronic devices to the first surface of the wafer while the construct has a thickness sufficient to withstand such forming or applying steps without breaking or being damaged, but wherein the connecting bond is severable at the interface due to the void features to separate the substrate from the wafer so that the substrate can be reused.