Patent ID: 11881831
Assignee: AKOUSTIS, INC.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A method for fabricating an acoustic resonator device, the method comprising:
providing a seed substrate having a substrate crystallographic orientation;
placing the seed substrate within a processing chamber having a controlled environment;
heating the seed substrate to a first desired temperature within the processing chamber;
cooling the seed substrate to a second desired temperature within the processing chamber;
after cooling the seed substrate to the second desired temperature, initiating a film growth process having film growth conditions by introducing reactants to the controlled environment of the processing chamber to form a nucleation layer overlying the seed substrate;
modifying the film growth conditions by adjusting the controlled environment of the processing chamber, the film growth conditions including piezoelectric film growth conditions;
forming on the nucleation layer a strained piezoelectric film having an acoustic velocity range of ±1000 m/s by modifying the strain of the piezoelectric film using the modified film growth conditions thereby changing the piezoelectric properties of the strained piezoelectric film and improving fabrication flexibility such that acoustic properties of a device or devices subsequently fabricated using the strained piezoelectric film can be tuned to correspond with a particular application of the device or each device;
after forming the strained piezoelectric film, turning off the reactants; and
reducing the temperature of the processing chamber to room temperature.