Patent ID: 11901872
Assignee: JWL (ZHEJIANG) SEMICONDUCTOR CO., LTD
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A method for manufacturing a thin film bulk acoustic wave resonator, comprising:
providing a stack covering an acoustic reflection structure located at a surface of a substrate, wherein the stack comprises a bottom electrode layer, a piezoelectric layer, and a top electrode layer, wherein:
a portion of the piezoelectric layer is depolarized to form a depolarized portion of which piezoelectricity is eliminated; and
along a direction perpendicular to the substrate, a projection of a part of the depolarized portion on the substrate is:
located outside of a projection of the acoustic reflection structure on the substrate,
located inside of a projection of the top electrode layer on the substrate, and
located inside of a projection of the bottom electrode layer on the substrate.