Patent ID: 8572825
Filing Date: 2013-11-05
Classification: C30B,H01L,H03H,Y10T

Abstract:
1. A method for producing a piezoelectric composite substrate including a first piezoelectric single crystal material, in which a piezoelectric effect is used, and a second piezoelectric single crystal material bonded to the first piezoelectric single crystal material, the method comprising: an ion-implantation step of implanting ions into a first polar surface of the first piezoelectric single crystal material, the first polar surface having a substantially uniform polarity, to form localized microcavities in a separation layer located inside the first piezoelectric single crystal material and spaced apart from the first polar surface; after the ion-implantation step, a bonding step of bonding the first polar surface of the first piezoelectric single crystal material to a second polar surface of the second piezoelectric single crystal material, the second polar surface having a substantially uniform polarity opposite to that of the first polar surface; and after the bonding step, a separation step of subjecting the microcavities to thermal stress to divide the separation layer from a portion of the first piezoelectric single crystal material.