Patent ID: 7927972
Filing Date: 2011-04-19
Classification: H01L

Abstract:
1. A method for producing a bonded wafer by bonding a wafer for active layer to a wafer for support layer with or without an insulating film and then thinning the wafer for active layer, which comprises a series of: (1) a step of implanting oxygen ions into a wafer for active layer; (2) a step of bonding the wafer for active layer to a wafer for support layer either directly without an insulating film or indirectly with an insulating film; (3) a step of thinning the wafer for active layer in the bonded wafer to expose the oxygen ion implanted layer; (4) a step of removing the oxygen ion implanted layer in the wafer for active layer, and (5) a step of planarizing and/or thinning the surface of the wafer for active layer by heat treatment and/or polishing, wherein the oxygen ion implanted layer is removed by repetitive treatment with an oxidizing solution and an HF solution in the above step (4).