Science Daily October 26, 2023
2D multilayered halide perovskites have emerged as a platform for understanding organic–inorganic interactions, tuning quantum confinement effects and realizing efficient and durable optoelectronic devices. However, reproducibly synthesizing 2D perovskite crystals with a perovskite-layer thickness using existing crystal growth methods is challenging. An international team of researchers (Rice University, Houston, Northwestern University, University of Pennsylvania, France) demonstrated a kinetically controlled space confinement for the growth of phase-pure Ruddlesden–Popper and Dion–Jacobson 2D perovskites. Phase-pure growth was achieved by progressively increasing the temperature for a fixed time or the crystallization time at a fixed temperature, which allowed for control of the crystallization kinetics. In situ photoluminescence spectroscopy and imaging suggested that the controlled increase in n-value occurred due to intercalation of excess precursor ions. Based on experimental data sets phase diagrams for both Ruddlesden–Popper and Dion–Jacobson perovskites were constructed to predict the growth of 2D phases with specific n-values, facilitating the production of 2D perovskite crystals with desired layer thickness… read more. TECHNICAL ARTICLE
Refined phase diagram… Credit: Nature Synthesis, 23 October 2023