Finding acoustic and piezoelectric film windows requires balancing composition, phase, texture, stress, thickness, microstructure, and process conditions before resonator-level builds.
Preparing thin-film libraries that vary composition and selected process variables, then mapping composition, XRD phase or texture, morphology, and scoped electrical or mechanical response.
Composition-spread films; process-window studies; XRD phase and texture; morphology review; electrical or mechanical screening; uniform film follow-up.
Plausible material and process windows are identified before device builds. Material-region questions are separated from later device-design and fabrication questions.