Patent ID: 7291055
Filing Date: 2007-11-06
Classification: B24B,H01L

Abstract:
1. A wafer polishing method using a polishing apparatus which comprises a rotatable table having a polishing cloth adhered thereon and a polishing head equipped with a wafer holding plate opposing to the table and in which the back surface of the wafer is held by a holding surface of the wafer holding plate and the front surface of the wafer is pressed to and polished by the polishing pad, comprising a polishing step of polishing the front surface of the wafer to a predetermined total polishing stock removal without changing the polishing apparatus, wherein the polishing step is divided into plural sub-steps and a holding position of the wafer in a subsequent sub-step is different from a holding position of the wafer in a previous sub-step, wherein the change of the wafer holding position is performed by rotating a holding position of the wafer about the center thereof as the center of rotation by a predetermined rotational angle and the predetermined rotational angle is set to an angle obtained by dividing outer peripheral waviness of the wafer by the number (n) of the sub-steps.