Patent ID: 9324558
Filing Date: 2016-04-26
CPC Classification: B24B,H01L

Claim Text:
1. A machining process for a semiconductor wafer including grinding a wafer obtained by slicing a semiconductor single crystal ingot by using a wire saw apparatus to obtain a thin discoid wafer, the process comprising: (i) forming a layer by applying a curable material to one entire surface of the wafer after slicing to form a flat application layer; (ii) firstly grinding a surface by mounting the wafer on a table of a grinding apparatus in such a manner that the one surface of the flattened wafer abuts on a reference surface of the table, and then performing surface grinding with respect to the other surface of the wafer with the use of the grinding apparatus; (iii) removing an application layer by removing the application layer from the one surface of the wafer after firstly grinding the other surface of the wafer; and (iv) secondly grinding the surface by mounting the wafer on the table of the grinding apparatus in such a manner that the other surface of the wafer from which the application layer has been removed abuts on the reference surface of the table, and then performing surface grinding with respect to the one surface of the wafer with the use of the grinding apparatus; wherein (i) forming a layer to (iv) secondly grinding the surface are repeatedly performed; and wherein a grinding amount when grinding the surface of the wafer to which the curable material has been applied that is performed precedently is equal to or higher than a grinding amount when grinding the surface of the wafer to which the curable material has been applied that is performed afterwards.