Publication date: 8th July 2026
In this work, we combine time-resolved in situ small- and wide-angle X-ray scattering (SAXS/WAXS) with in situ UV-Vis absorption spectroscopy to elucidate the formation mechanism of 3-monolayer-thick CsPbBr3 nanoplatelets (NPLs). We characterize all precursors individually and monitor their evolution at each stage of the synthesis, clarifying the role of oleylamine in stabilizing intermediate species prior to nucleation. We identify the formation of a metastable intermediate species, approximately 2 × 4 × 5 nm in size, present in the precursor solution before nanoplatelet formation begins. We show that the addition of an antisolvent leads to controlled destabilization of this intermediate, which in turn governs the nucleation and growth kinetics of the NPLs. SAXS analysis further reveals that these intermediate species are consumed through two possible pathways: acting directly as seeds for nucleation, or serving as a reservoir of material that supplies the growing nanoplatelets during subsequent growth stages.
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