Publication date: 22nd July 2026
Metal halide perovskite single crystals have emerged as a promising platform for integrated nonlinear photonic devices. Their large exciton binding energies, strong oscillator strengths, and compatibility with micro- and nanofabrication have enabled the realization of room-temperature polaritonic waveguides, microcavities, and interferometers.
The fabrication of such photonic elements requires the development of geometrically confined crystallization methods capable of providing precise control over crystal morphology. In this context, this talk explores different approaches, including microfluidic growth and dewetting-assisted growth, which combine precursor-solution confinement with fine control over nucleation and crystallization pathways. By optimizing the growth conditions and tailoring interactions within the precursor solution, these methods enable the realization of a wide variety of geometries, including wires, square pixels, and interferometric structures.[1-3] In addition, these approaches allow accurate control over crystal placement on the substrate, which is essential for device integration.
While these approaches address the fabrication challenges associated with integrated photonic architectures, the practical implementation of metal halide perovskites is still limited by their intrinsic instability. Continuous or high-power optical excitation can induce photo-induced degradation and chemical instability, compromising device reproducibility and long-term operation. Developing effective defect-passivation strategies is therefore essential to move from proof-of-concept demonstrations to reliable integrated photonic devices.
The second part of this talk focuses on the use of ionic liquids as an effective passivation strategy to enhance both optical quality and material stability. In particular, the incorporation of the 1-butyl-3-methylimidazolium (BMIM)-based ionic liquid during crystal growth leads to higher photoluminescence intensity, longer excited-state lifetimes, and reduced optical losses, providing a promising route toward more efficient and robust integrated photonic circuits.
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