Patent ID: 7507146

Claim:
A method for producing a semiconductor wafer, the wafer having two main surfaces, comprising: a chamfering step to chamfer the wafer to form a chamfered portion of the wafer, the chamfered portion including a first portion at a periphery of the wafer, and a second portion between the first portion and each main surface, the first portion having an end surface, each second portion having a chamfered surface that slopes from the respective main surface to the end surface; a first chamfered-portion polishing step that polishes the chamfered-portion of the wafer so that at least one chamfered surface in the chamfered portion of the wafer is in contact with a polishing pad; a double-side polishing step that polishes both main surfaces of the wafer; a second chamfered-portion polishing step that polishes the chamfered-portion of the wafer so that at least the end surface of the chamfered portion of the wafer is in contact with a polishing pad; and so that both main surfaces of the wafer are not in contact with a polishing pad during the second chamfered-portion polishing step.