Publication date: 15th May 2026
Nucleation and growth kinetics within the supersaturation regime fundamentally dictate crystalline architecture and defect evolution. By operating precisely within the thermodynamic metastable zone width (MSZW), crystal growth can be selectively partitioned: the lower boundary near the equilibrium solubility curve favors the slow, thermodynamic stabilization of high-density facets via Bravais’ law, whereas the upper boundary near the labile limit shifts kinetics toward the Frank–Chernov regime, where morphology is driven by fast-propagating, low-(d)-spacing planes. Here, we exploit these localized intra-metastable zone dynamics to demonstrate the controlled synthesis of hierarchical, multiscale perovskite superlattices within bulk halide perovskite crystals. Utilizing either single-stage or two-stage kinetic pathways designed to systematically sweep across the metastable zone, we realize three-dimensional crystalline assemblies composed of overlapping atomic planes with diverse interplanar spacing. Partial commensuration between these kinetically trapped lattice planes gives rise to an array of quasiperiodic configurations that maintain long-range translational symmetry. Within these metastable-engineered bulk perovskite superlattices, we observe robust excitonic collective phenomena, including superradiant emission with thermal stability persisting to elevated temperatures. These results decisively expand the scope of moiré engineering into bulk solids, establishing versatile operational platforms for next-generation quantum photonic applications under ambient conditions.
M.V. acknowledges funding from the European Innovation Council (EIC), project SUPERLASER under grant agreement No. 101162503. The EIC receives support from the European Union’s Horizon Europe research and innovation program.
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