Analytical and simulation-based framework for selecting piezoelectric materials for sensor design

The choice of the correct piezoelectric material is essential for piezoelectric sensors to fulfill the required sensitivity, stability, flexibility, and integration capability. In this work, an analytical and simulation-based framework for comparative evaluation of lead zirconate titanate (PZT), PVDF, Quartz, aluminum nitride (AlN), and ZnO for piezoelectric sensor design is developed. The framework takes into account piezoelectric response, thermal stability, mechanical behavior, and compatibility with fabrication. Analytical models were used to investigate the growth behavior of PZT films and the effect of mechanical stretching and thermal treatment on the β -phase formation of PVDF. Under the assumed model conditions, the PZT model predicts a total film thickness of 750–800 nm for three deposited layers. For PVDF, the calculated β -phase fraction increases from ~0.20 to 0.72 at a stretching ratio of 5×, and values >0.80 are expected at a stretching ratio of ~4 to 5× and processing temperatures of 80 °C–90 °C. The comparative analysis shows PZT possesses the highest d 33 range (300–600 pC/N), PVDF offers high mechanical flexibility, AlN possesses good MEMS compatibility and thermal stability, Quartz has high thermal stability, and ZnO is promising for nanostructured sensor architectures. The results show that there is no single best material and that the selection of materials must be guided by the requirements of the intended application. The proposed framework offers a preliminary analytical basis for the selection of piezoelectric materials and design of sensors. The process-dependent predictions need experimental calibration and validation for specific fabrication systems.