Patent ID: 9266215
Filing Date: 2016-02-23
CPC Classification: B24B,H01L

Claim Text:
1. A method of double-side polishing a wafer, comprising: simultaneously polishing both surfaces of the wafer by holding the wafer in a holding hole of a carrier, interposing the held wafer between upper and lower turn tables to which polishing pads are attached, rotating the carrier about an axis of the carrier and revolving the carrier; repeating the polishing in a batch manner; and dressing the polishing pads such that a mean deviation of surface roughness is not less than 4 μm but not more than 5 μm, the mean deviation of surface roughness being represented by a standard deviation of irregularities of a surface of the polishing pads and obtained by scanning with a contact type of roughness meter in a direction opposite a dressing direction of the polishing pads, wherein a direction in which the carrier is revolved is reversed every polishing batch while repeating the polishing in a batch manner.