Patent ID: 6984540
Filing Date: 2006-01-10
Classification: H01L,H03H

Abstract:
1. A method for producing a surface acoustic wave device having a piezoelectric substrate, a first interdigital electrode and a second interdigital electrode formed on the substrate so that the first and second interdigital electrodes are opposed to each other, the first and second interdigital electrodes including an insulating layer in surfaces thereof, the method comprising: (a) forming the first interdigital electrode and the second interdigital electrode on the piezoelectric substrate so that the first and second interdigital electrodes are opposed to each other; (b) forming a doping region in a surface between the first and second interdigital electrodes by doping the surface of the substrate with a substance in at least one form selected from the group consisting of atoms, molecules and clusters before or after the process (a); and (c) forming the insulating layer in surfaces of the first and second interdigital electrodes by doping the surfaces of the first and second interdigital electrodes with impurities after the process (a), wherein the processes (b) and (c) are performed at the same time by doping with the substance used for the process (b).