Liffredo, MarcoVillanueva, GuillermoTchatat Njieyep, Victoire Sephora2024-07-262024-07-262024-07-262024-10-20https://infoscience.epfl.ch/handle/20.500.14299/240473Ferroelectricity is a notable characteristic of certain materials, defined by a spontaneous electric polarization that can be reversed through the application of an external electric field. These ferroelectric materials also exhibit piezoelectric and pyroelectric properties, enabling the conversion of mechanical stress or temperature variations into electrical signals. Consequently, ferroelectric materials are highly valuable in a broad spectrum of applications, including sensors, actuators, and memory devices. The primary focus of this project is to investigate ferroelectric devices composed of AlScN with a 40% Scandium (Sc) concentration. The project methodology is structured into three main phases. Initially, the resonance frequency of the ferroelectric resonators is measured. Following this, the devices undergo characterization, where hysteresis loops are obtained for various applied voltages, and the coercive field is determined. The final phase involves applying a specific waveform to the devices at the coercive voltage and observing the subsequent behaviour of the resonance frequency after poling. In fact, Rassay et al. clearly describe the expected result after poling which includes the excitation of the second mode of each tested resonator. This report is structured to provide comprehensive insight into the project. It begins with essential definitions related to ferroelectricity. This is followed by a detailed description of the experimental setup. The report then delves into the processes followed and presents the results obtained from the experiments conducted on each of the wafers.student work::semester or other student projects