Research & development - Leuven | More than two weeks ago
Lead Zirconate Titanate (PZT) is one of the more efficient piezoelectric material used in several practical applications such as ultrasonic transducers and piezoelectric resonators. PZT exhibits greater sensitivity and has a higher operating temperature compared to other piezo materials. Due to its physical strength, chemical inertness, tailorability, and relatively low manufacture costs, it is one of the most used piezo ceramics in the industry. Being piezoelectric, PZT develops a voltage across two of its faces when compressed (useful for sensor applications) and deforms the structure when an external electric field is applied (useful for actuator applications). However, PZT is also ferroelectric which means that its spontaneous electric polarization can be reversed in the presence of a high electric field. The polarization curve is showing some hysteresis. Moreover, PZT is also showing some pyroelectric behavior and can create a voltage difference under changing temperature conditions.
Imec is developing new type of piezoelectric actuators based on PZT piezo material subject to high voltage and high temperature. The goal of this postdoc will be to model carefully the nonlinear behavior of the PZT depending of the electric field and the thermal condition. Finite Element Method will be used to capture the full nonlinear problem. This model will be validated with experimental measurements on representative test structures. Finally, a reduced model will be proposed including the nonlinearities for fast simulations for a specific application. The postdoctoral researcher will be in contact with different teams at imec, including the process team.
Type of work: 15% literature study, 70% modeling, 15% characterization
Supervisor: Ingrid De Wolf
This postdoctoral position is funded by imec through KU Leuven. Because of the specific financing statute which targets international mobility for postdocs, only candidates who did not stay or work/study in Belgium for more than 24 months in the past 3 years can be considered for the position (short stays such as holiday, participation in conferences, etc. are not taken into account).