Patent ID: 9385301
Filing Date: 2016-07-05
CPC Classification: G02F,H01L,H03H,Y10T

Claim Text:
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 from 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; a third step of bonding the supporting substrate to the surface of the piezoelectric substrate to form a substrate bonded body; a fourth step of separating the substrate bonded body at the defective layer formed in the piezoelectric substrate so that a separation layer 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 the composite piezoelectric substrate; a fifth step of smoothing the surface of the separation layer of the composite piezoelectric substrate; and a polarization step of polarizing the separation layer of the composite piezoelectric substrate after the second step and before the third step, or after the third step to correct polarization inversion of piezoelectric material in the separation layer.