Patent ID: 6183555
Filing Date: 2001-02-06
Classification: H03H

Abstract:
A method of manufacturing a substrate for a surface acoustic wave device, said substrate comprising a sapphire single crystal substrate made of .alpha.-Al.sub.2 O.sub.3 and an aluminum nitride single crystal layer formed on a surface of said substrate, wherein said surface of the sapphire single crystal substrate is formed by an off-angled surface that is obtained by rotating an R(1-102) surface about an (11-20) axis by a given off-angle, and said aluminum nitride single crystal layer is formed by an aluminum nitride single crystal layer deposited on said off-angled surface of the sapphire single crystal substrate by a metal organic chemical vapor deposition to have a (1-210) surface, said method comprising the steps of:preparing a sapphire single crystal substrate made of .alpha.-Al.sub.2 O.sub.3 and having an off-angled surface that is obtained by rotating an R(1-102) surface about an axis by a given off-angle, anddepositing, on said off-angled surface of the sapphire single crystal substrate, an aluminum nitride single crystal layer by a metal organic chemical vapor deposition to have a (1-210) surface to form a substrate for a surface acoustic wave device, said substrate comprising a sapphire single crystal substrate made of .alpha.-Al.sub.2 O.sub.3 and an aluminum nitride single crystal layer formed on a surface of said substrate, wherein said surface of the sapphire single crystal substrate is formed by an off-angled surface that is obtained by rotating an R(1-102) surface about an (11-20) axis by a given off-angle, and said aluminum nitride single crystal layer is formed by aluminum nitride single crystal layer deposited on said off-angled surface of the sapphire single crystal substrate by a metal organic chemical vapor deposition to have a (1-210) surface.