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Liquid Surface Synthesis of Ultrathin Two-Dimensional Metal Halide Perovskite
Jiaxiong Li1, Mordechai Kot1, Nina Cielica1
1Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 3, Groningen 9747 AG, The Netherlands.
ACS Materials Letters
|March 6, 2026
Summary
Researchers developed a scalable liquid surface synthesis for ultrathin 2D metal halide perovskite sheets. This method yields large-area, sub-10 nm thick materials crucial for advanced optoelectronics.
Area of Science:
- Materials Science
- Nanotechnology
- Solid-State Physics
Background:
- Two-dimensional (2D) metal halide perovskites offer tunable quantum confinement based on the number of inorganic slabs (n).
- Large-area, ultrathin 2D perovskite sheets are essential for fabricating next-generation thin-sheet optoelectronic devices and heterostructures.
Purpose of the Study:
- To develop a scalable synthesis method for producing well-defined, ultrathin 2D perovskite sheets.
- To investigate the potential of liquid surface crystallization for controlled perovskite growth.
Main Methods:
- Perovskite precursor solutions were introduced onto an antisolvent liquid surface.
- Controlled crystallization was achieved by engineering the subphase and spreading phase compositions.
- Structural and spectroscopic characterizations were performed to analyze the synthesized materials.
Main Results:
- Achieved scalable synthesis of well-defined n=1 2D perovskite sheets with sub-10 nm thickness and up to 50 μm lateral size.
- Demonstrated high phase purity and clean excitonic emission from the synthesized sheets.
- Observed optical properties comparable to high-quality films produced by blade coating.
Conclusions:
- Liquid surface synthesis is a promising scalable strategy for fabricating high-quality ultrathin 2D perovskite sheets.
- The engineered crystallization at the antisolvent-air interface enables precise control over 2D perovskite formation.
- These findings highlight the potential for advanced optoelectronic applications using these synthesized materials.
