Patent ID: 9550264
Date: 2017-01-24
CPC Classifications: B24B,B24D,H01L

Claim:
1. A method of fixed abrasive-grain processing of a plurality of semiconductor wafers to a flatness as that obtained by a two-step process of a conventional lapping step and a finishing grinding step, the method comprising: using a fixed abrasive-grain processing device including: vertically separating the upper surface-plate from the lower surface-plate, setting the plurality of semiconductor wafers in the holes of the carrier plate; bringing the upper surface-plate close to the lower surface-plate; applying a pressure of 250-400 g/cm performing a single step planarizing of the top surfaces and the bottom surfaces of the plurality of semiconductor wafers at the same time at a processing rate of greater than 14 μm/min by concurrently rotating the lower surface-plate and the upper surface-plate in opposite rotational directions about the axis of rotation, and circularly moving the carrier plate using the carrier rotating device while maintaining the pressure by the lower fixed abrasive-grain layer and the upper fixed abrasive-grain layer against the top surfaces and the bottom surfaces, respectively, of the plurality of semiconductor wafers.