| Title |
Emergence of a relaxor phase and dimensional tuning in mixed 2D hybrid perovskites |
| Authors |
Rimkus, Gabrielius ; Balčiūnas, Sergejus ; Ga̧gor, Anna ; Szewczyk, Daria ; Fedoruk-Piskorska, Katarzyna ; Zarȩba, Jan K ; Sieradzki, Adam ; Klimavičius, Vytautas ; Banys, Jūras ; Ma̧czka, Mirosław ; Šimėnas, Mantas |
| DOI |
10.1021/acs.chemmater.6c00851 |
| Full Text |
|
| Is Part of |
Chemistry of materials.. Washington : American Chemical Society. 2026, vol. 38, iss. 13, p. 6681-6690.. ISSN 0897-4756. eISSN 1520-5002 |
| Keywords [eng] |
perovskites ; insulators ; cations ; polarization ; phase transitions |
| Abstract [eng] |
Mixing of molecular cations in hybrid lead halide perovskites offers a powerful route to tailor their optoelectronic functionality, structural stability, and phase transition behavior. While such compositional engineering has been extensively studied in three-dimensional perovskites, its impact on low-dimensional analogues remains largely unexplored. Here, we investigate cation mixing in the Ruddlesden–Popper BA2MAn-1PbnBr3n+1 two-dimensional perovskites using a comprehensive multitechnique approach. We show that substituting methylammonium (MA) with dimethylammonium (DMA) transforms the long-range ferroelectric phase into a state characterized by frustrated electric dipoles. Broadband dielectric measurements reveal that this state is a relaxor phase, which was previously unobserved in three-dimensional hybrid perovskites. Remarkably, cation mixing also governs perovskite dimensionality, enabling stabilization of thick-slab members up to n = 5 in single-crystal form. These results establish cation mixing as a versatile tool for controlling both polar order and dimensionality in two-dimensional hybrid perovskites. |
| Published |
Washington : American Chemical Society |
| Type |
Journal article |
| Language |
English |
| Publication date |
2026 |
| CC license |
|
