Patent ID: 8973229
Filing Date: 2015-03-10
Classification: G02F,H01L,H03H,Y10T

Abstract:
1. A method for manufacturing a composite piezoelectric substrate comprising: a first step of preparing a piezoelectric substrate and a supporting substrate; a second step of implanting ions into a surface of the piezoelectric substrate to form a defective layer in a region at a predetermined depth from the surface of the piezoelectric substrate, the second step being performed such that an amount and an energy of the ions implanted into the surface of the piezoelectric surface are sufficient to cause a polarization inversion to occur in the piezoelectric substrate; a cleaning activation step of removing impurities adhered to at least one of the surface of the piezoelectric substrate in which the defective layer is formed and a surface of the supporting substrate to directly expose constituent atoms of the at least one of the surface of the piezoelectric substrate in which the defective layer is formed and the surface of the supporting substrate and to activate the at least one of the surface of the piezoelectric substrate in which the defective layer is formed and the surface of the supporting substrate; a third step of bonding the supporting substrate to the surface of the piezoelectric substrate after the cleaning activation step to form a bonded substrate body; a fourth step of separating the bonded substrate body at the defective layer formed in the piezoelectric substrate so that a separation layer of the piezoelectric substrate located between the surface of the piezoelectric substrate and the defective layer is separated from the piezoelectric substrate and bonded to the supporting substrate to form a composite piezoelectric substrate; a fifth step of smoothing a surface of the separation layer of the composite piezoelectric substrate; and a step of correcting the polarization inversion of the separation layer of the piezoelectric substrate by polarizing the separation layer after the second step.