Ferroelectricity in Hybrid Perovskites

Current research on ferroelectric materials often focuses on oxide ceramics like PZT due to their well-established properties. These materials are used in various technologies because of their piezoelectric and pyroelectric characteristics. However, recent studies have explored hybrid perovskites as potential alternatives. These materials offer optical and electronic properties with lower fabrication costs. Despite this, the ferroelectric behavior of hybrid perovskites remains controversial. Some studies suggest ferroelectricity in methylammonium iodoplumbate perovskites, while others question these findings. Low-dimensional perovskites have emerged as a clearer platform for studying ferroelectricity. This paper reviews the current state of knowledge and identifies gaps in understanding ferroelectric figures of merit and thermal stability in hybrid perovskites.

The purpose of this review is to evaluate the ferroelectric properties of hybrid perovskites. The authors aim to clarify the controversies surrounding ferroelectricity in methylammonium iodoplumbate perovskites. They also seek to assess the potential of low-dimensional perovskites as a platform for ferroelectric applications. The study addresses the lack of consensus on ferroelectric figures of merit in these materials. It also explores how these materials compare to conventional oxide ferroelectrics in terms of performance. The authors aim to highlight the structure-property tunability of low-dimensional perovskites. They also seek to identify limitations in polarization and thermal stability. The review provides a foundation for future research on hybrid perovskite ferroelectrics.

The authors employed a review approach to synthesize existing literature on hybrid perovskite ferroelectricity. They first described methods used to quantify ferroelectric properties, such as saturated polarization and Curie temperature. The review focused on methylammonium iodoplumbate perovskites and the controversies surrounding their ferroelectricity. They analyzed data from low-dimensional perovskites to assess their ferroelectric potential. The authors compared these materials to conventional oxide ferroelectrics like PZT. They examined applications in solar cells, LEDs, and X-ray detectors. The review included a critical evaluation of structure-property relationships. The authors highlighted gaps in thermal stability and polarization metrics.

The review found that ferroelectricity in methylammonium iodoplumbate perovskites remains controversial. Low-dimensional perovskites offer a clearer platform for ferroelectric studies. These materials show tunable structure-property relationships. However, they lack saturated polarization values comparable to conventional ferroelectrics. The Curie temperature in low-dimensional perovskites is lower than in oxide materials. Applications in solar cells and X-ray detectors have been explored. Ferroelectric figures of merit remain suboptimal compared to PZT. The authors suggest that further research is needed to improve thermal stability.

The authors conclude that low-dimensional hybrid perovskites have potential for ferroelectric applications. However, they have not yet matched the performance of conventional oxide ferroelectrics. The structure-property tunability is a key advantage. Ferroelectric figures of merit, such as saturated polarization, remain suboptimal. Thermal stability, as indicated by Curie temperature, is also a limitation. The authors emphasize the need for further research to improve these properties. Applications in solar cells and X-ray detectors are promising but require optimization. The review highlights the importance of addressing current limitations in polarization and thermal stability.