Perovskite Nanoparticle Composite Films by Size Exclusion Lithography

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Perovskite nanoparticles offer unique optical properties but often suffer from poor stability and limited patterning capabilities.
• Developing robust composite materials for high-resolution patterning remains a challenge in optoelectronics.

Purpose of the Study:

• To create perovskite nanoparticle composite films with high-resolution patterning capabilities (≥2 µm).
• To enhance the stability of perovskite nanoparticles against aqueous and organic solvents.
• To achieve tunable photoluminescence across the visible spectrum.

Main Methods:

• In situ photosynthesis of acrylate polymers and formamidinium lead halide (FAPbX3) nanoparticles.
• Controlled size-exclusive flow of nanoparticles within polymer networks for patterning.
• Spatial control of nanoparticle positioning in lateral and vertical directions.

Main Results:

• Achieved high-resolution patterning (≥2 µm) with excellent solvent resistance.
• Demonstrated both positive- and negative-tone patterning of FAPbX3 nanoparticles.
• Obtained high photoluminescence quantum yield (up to 44%) and broad color tunability (λpeak = 465–630 nm).

Conclusions:

• The developed composite films provide a versatile platform for fabricating high-performance optoelectronic devices.
• The in situ synthesis and controlled patterning offer a pathway to stable and tunable perovskite-based nanostructures.
• These materials are promising for applications requiring precise optical control and environmental stability.