Laser-Assisted Fabrication for Metal Halide Perovskite-2D Nanoconjugates: Control on the Nanocrystal Density and Morphology
Konstantinos Brintakis a, Athanasia Kostopoulou a, Emmanuel Stratakis a b
a Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, Greece
b Department of Physics, University of Crete,, Heraclión, Grecia, Crete, Greece
Poster, Konstantinos Brintakis, 024
Publication date: 6th May 2020

We report a facile and rapid laser-induced process to fabricate perovskite-2D nanoconjugates. In particular, pre-prepared nanocrystals were mixed with the GO materials in solution and irradiated with a femtosecond laser at ambient conditions. It was observed that the density of the nanocrystals on the flakes can be controlled by the number of the irradiation pulses. Τhe laser pulses were efficient to promote the creation of functional groups on GO which allow perovskite crystals to bind to GO and cover the available flakes. Τhe irradiation can damage perovskite crystals so the dose has to be kept sufficiently low (<1000 pulses) to preserve their structure and morphology and eventually the luminescent properties. The solution of the nanoconjugates was PL-active following the irradiation process. The importance of this fast and easy process is that it presents a universal procedure to decorate 2D materials with metal halide nanocrystals. This laser-assisted process enables the creation of many conjugates with perovskite nanocrystals of various composition and shape. The nanoconjugates combine the exciting properties of the perovskite nanocrystals together with the interesting properties of the 2D materials. In addition, new physics and synergetic effects are emerging from the coupling between the two different materials. Among our future plans is to use this laser-assisted method to enhance the PL of the nanocomposites.

General Secretariat for Research and Technology (GSRT) and Hellenic Foundation for Research and Innovation (HFRI), contract number: 1179

We would like to thank Kyriaki Savva, Nikolaos Livakas and Michaila-Akathi Pantelaiou for their help in the laser experiments and Minas Stylianakis for the preparation of the GO solution. Finally, we would like also to thank the Microscopy Laboratory of the University of Crete for giving access to the HRTEM microscope.

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