Wafer production method
The present invention is a wafer production method at least comprising a chamfering step of chamfering a wafer sliced from an ingot using a grindstone for chamfering, and a step of obtaining a product wafer thinner than the chamfered wafer by performing at least one or more than one of the following processes on the chamfered wafer: flattening, etching, and polishing, the method at least comprising a correction step of chamfering a dummy wafer equivalent in thickness to the product wafer, measuring the chamfered dummy wafer for its chamfered shape, and correcting the shape of the grindstone for chamfering based on the measured chamfered shape of the dummy wafer, at least before the chamfering step, thereby chamfering the wafer sliced from the ingot using the grindstone for chamfering having its shape corrected. Thus, it is possible to provide a wafer production method allowing a product wafer with a desired chamfered shape to be obtained in a short period of time.
1. A method for producing a wafer at least comprising:
a slicing step of slicing an ingot to obtain a wafer,
a chamfering step of chamfering the wafer sliced from the ingot using a grindstone for chamfering,
a step of obtaining a product wafer thinner than the chamfered wafer by performing a flattening process on the chamfered wafer,
a correction step comprising:
chamfering a dummy wafer equivalent in thickness to a predetermined standard thickness of the product wafer,
measuring chamfered portions of the chamfered dummy wafer, and
correcting the shape of the grindstone for chamfering based on the measured chamfered portions of the chamfered dummy wafer, at least before the chamfering step of chamfering the wafer sliced from the ingot, thereby chamfering the wafer sliced from the ingot using the grindstone for chamfering having its shape corrected,
wherein at least after the correction step, the grindstone for chamfering having its shape corrected is used to chamfer a dummy wafer equivalent in thickness to the wafer sliced from the ingot,
dimensions of chamfered portions of the chamfered dummy wafer are measured, and
dimensions of the measured chamfered portions of the dummy wafer are set as intended chamfer values for the wafer sliced from the ingot.
2. The method for producing a wafer according to claim 1 , wherein the grindstone for chamfering is corrected on machine.
3. The method for producing a wafer according to claim 1 , wherein the grindstone for chamfering has a forming groove, and chamfering is performed with the forming groove in contact with the periphery of the wafer.
4. The method for producing a wafer according to claim 2 , wherein the grindstone for chamfering has a forming groove, and chamfering is performed with the forming groove in contact with the periphery of the wafer.
5. The method for producing a wafer according to claim 1 , wherein the grindstone for chamfering is a cylindrical rotary outer-diameter grindstone, and the rotary outer-diameter grindstone for chamfering is movable relative to thickness and diameter directions of the wafer to chamfer the wafer.
6. The method for producing a wafer according to claim 2 , wherein the grindstone for chamfering is a cylindrical rotary outer-diameter grindstone, and the rotary outer-diameter grindstone for chamfering is movable relative to thickness and diameter directions of the wafer to chamfer the wafer.