研究目的
To develop a large-scale low-cost technique for subwavelength perovskite structures fabrication preserving highly efficient luminescence.
研究成果
The study demonstrates that direct femtosecond laser ablation of organic–inorganic metal-halide perovskite (MAPbI3) by optimized pulse trains with specially designed beam profiles allows one to reproducibly create light-emitting subwavelength resonant nanostructures of high quality without reduction of luminescent properties. This was not successfully achieved so far with standard light-emitting semiconductors ablated directly by laser pulses.
研究不足
The grain size of processed MAPbI3 films (≈100–200 nm) limited spatial resolution.
1:Experimental Design and Method Selection:
The study employs projection femtosecond laser lithography for nanofabrication with precise spatial control in all three dimensions preserving the material luminescence efficiency.
2:Sample Selection and Data Sources:
Glass-supported MAPbI3 films with thicknesses of 225 ± 20 and 425 ± 20 nm were used.
3:List of Experimental Equipment and Materials:
A regeneratively amplified Yb:KGW-laser system (Pharos, Light Conversion) for generating 180-fs second-harmonic (515 nm) laser pulses, SEM (Ultra 50+, Carl Zeiss) for morphology study, and confocal fluorescent scanning inverted microscope (LSM 800, Carl Zeiss) for PL mapping.
4:Experimental Procedures and Operational Workflow:
The laser beam was focused onto the sample surface with a dry microscope objective (5×, NA =
5:15). The number of applied pulses N in the multi-pulse processing regime was controlled by built-in laser system software. Data Analysis Methods:
The morphology of the laser-processed perovskite films was studied with SEM, and the local PL signal of MAPbI3 films was mapped with a confocal fluorescent scanning inverted microscope.
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