Publication date: 15th May 2026
Metal halide perovskites have emerged as promising materials for next-generation quantum photonic and coherent light-emission applications due to their exceptional optoelectronic properties, high photoluminescence quantum yields, long carrier diffusion lengths and strong excitonic behaviour. However, conventional nanocrystal superlattices frequently suffer from ligand-induced decoherence, interparticle grain boundaries, and structural disorder, limiting the preservation of long-range optical coherence required for cooperative emission phenomena such as superradiance. Continuous single-crystal superlattice architectures may provide an alternative route towards structurally coherent room-temperature quantum emitters.
In this work, we investigate the additive-assisted inverse temperature crystallisation (ITC) growth of mixed-cation methylammonium-formamidinium lead iodide (MAFA) single crystals and superlattice-like architectures. The crystallisation process is systematically engineered using hydroiodic acid (HI), acetic acid (AcOH) etc., as chemical additives to modulate precursor coordination chemistry, supersaturation kinetics, nucleation behaviour, crystal growth dynamics, suppress rapid nucleation and favour the formation of large, homogeneous, and structurally ordered single crystals.
The additives are expected to influence the Pb-halide coordination equilibria and prolong the metastable crystallisation window during growth in γ-butyrolactone (GBL), enabling improved control over crystal morphology, facet development, and long-range structural ordering. In particular, HI is investigated for its ability to enhance iodide coordination and precursor solubility and AcOH for modulation of crystallisation kinetics through weak protonic coordination effects.
The resulting MAFA single crystals and superlattice-like structures are characterised using X-ray diffraction (XRD), optical microscopy, and micro-photoluminescence (μ-PL) mapping in order to evaluate phase purity, crystallographic ordering, morphology evolution, and spatial optical homogeneity. The relationship between additive chemistry, crystal growth pathways, and the emergence of ordered superlattice features is explored as a route towards coherence-preserving halide perovskite architectures.
This work is conducted within the framework of the European SUPERLASER project and aims to contribute towards the development of structurally coherent halide perovskite platforms for future room-temperature cooperative quantum light-emission technologies. Authors acknowledge funding from the European Innovation Council (EIC), project SUPERLASER under Grant Agreement No. 101162503.
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