Patent ID: 11124675

Abstract:
A substrate polishing method includes a stock polishing step comprising a plurality of stock polishing sub-steps in which a first polishing solution, a second polishing solution, and a third polishing solution are applied, in that order, to a substrate. A content COMP1 of water-soluble polymer P1 in the first polishing solution, a content COMP2 of water-soluble polymer P2 in the second polishing solution, and a content COMP3 of water-soluble polymer P3 in the third polishing solution satisfy COMP1<COMP2<COMP3, and any one of the following conditions is satisfied: (1) average primary particle diameter DA3 of abrasive A3 in the third polishing solution is smaller than average primary particle diameter DA1 of abrasive A1 in the first polishing solution and average primary particle diameter DA2 of abrasive A2 in the second polishing solution; and (2) the third polishing solution does not contain abrasive A3.