Patent ID: 6235611
Filing Date: 2001-05-22
Classification: B81C,G01L,Y10S

Abstract:
An improved method for making silicon-on-sapphire transducers comprising the steps of:forming a first silicon layer on a first side of a first sapphire wafer;bonding a second sapphire wafer to said first side of said first sapphire wafer such that said first silicon layer is interposed between said first and second sapphire wafers;reducing the thickness of said first sapphire wafer to a predetermined thickness;depositing a second silicon layer on a second surface of said first sapphire wafer, wherein said second surface of said first sapphire wafer is oppositely disposed from said first surface of said first sapphire wafer;bonding a silicon wafer to said second surface of said first sapphire wafer such that said second silicon layer is interposed between said first sapphire wafer and said silicon wafer, wherein said silicon wafer includes p+ regions indicative of a transducer structure and non-p+ regions; and,removing said non-p+ regions of said silicon wafer thus forming said transducer structure of p+ regions on said second surface of said first sapphire wafer.