Patent ID: 11936364
Assignee: SOITEC
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A method of fabrication of a surface acoustic wave device, comprising the steps of:
a) providing an electrode layer on top of a base substrate;
b) providing a piezoelectric layer on the electrode layer; and
c) forming an upper comb electrode layer including electrode fingers on the piezoelectric layer;
wherein, in step b), the piezoelectric layer is provided such that the piezoelectric layer comprises at least one region located in between the electrode fingers in which at least one physical parameter is different compared to a region underneath the electrode fingers, and
wherein step b) comprises one of an implantation or diffusion of atomic species in the region of the piezoelectric layer located between the electrode fingers and an etching step for removing part of the piezoelectric layer in the region of the piezoelectric layer located between the electrode fingers.