Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.198
Publication date: 16th December 2024
Two-dimensional layered lead-halide perovskites (2DLHPs) are currently in the spotlight for their high photoluminescence quantum yield and large structural and functional variety. Their layered structure gives them unique optoelectronic properties such as strong quantum and dielectric confinement[1]. This makes them highly promising for photonic and optoelectronic applications, and in that respect, achieving precise control over the quality and morphology of the synthesized crystals is crucial for unlocking their full potential.
Here, we developed a solvent-antisolvent recrystallization method to fabricate high-quality 2DLHPs microcrystals (MCs) with flat, nearly step-free surfaces. Our approach involves dissolving pre-synthesized 2DLHPs powder[2] and fine-tuning of parameters such as solvent/antisolvent choice and ratio, temperature, and saturation conditions. By optimizing these factors, we gained control over their lateral dimensions and thickness, and consistently produced high-quality MCs[3] on various substrates, including glass, silicon oxide, and gold, as well as on functionalized or pre-patterned areas. The compatibility with diverse substrates broadens the applicability of our MCs, offering seamless integration into devices. Moreover, our protocol demonstrates adaptability to multiple 2DLHP powders, broadening its applicability across different material systems.
The high structural quality and low defect density of the resulting MCs make them particularly suitable for photonic and optoelectronic applications, including light-emitting devices, waveguides, and quantum optics[4]. Our results represent a significant advancement in the fabrication of 2DLHP MCs, opening promising prospects for future integrations of this material.
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