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

Claim 9:
10. The method according to claim 9, wherein providing the stack covering the acoustic reflection structure located at the surface of the substrate comprises:
providing bottom electrode layer on the substrate;
providing the piezoelectric layer on the bottom electrode layer;
depolarizing the portion of the piezoelectric layer to form the depolarized portion; and
providing the top electrode layer on the piezoelectric layer;
wherein depolarizing the portion of the piezoelectric layer comprises:
depositing a hard mask or coating a photoresist on the piezoelectric layer;
patterning the hard mask or the photoresist to expose at least the portion of the piezoelectric layer;
performing ion implantation on the exposed portion of the piezoelectric layer; and
removing the hard mask or the photoresist.