A simple multiple centrifugation method for large-area homogeneous perovskite CsPbBr₃ films with optical lasing

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Large-scale cesium lead-halide (CsPbX₃) perovskite films are crucial for laser applications.
• Existing fabrication methods like spin-coating and thermal evaporation present a trade-off between quality and cost.

Purpose of the Study:

• To develop a facile and cost-effective method for preparing large-area, homogeneous perovskite CsPbBr₃ films.
• To investigate the impact of multiple centrifugal deposition and solvent annealing on film quality and laser performance.

Main Methods:

• A novel multiple centrifugal deposition and solvent annealing (MCDSA) method was employed.
• Film thickness was controlled by varying centrifugation cycles (1-4), ranging from 180 nm to 880 nm.
• Solvent annealing was utilized to further enhance film properties.

Main Results:

• The MCDSA method produced large-area (2.5 cm × 2.5 cm) crack-free films with low surface roughness (RMS of 32 nm).
• Increasing centrifugation cycles reduced laser threshold (18.1 to 14.2 μJ cm^-2) and increased gain coefficient (78.5 to 112.7 cm^-1).
• Solvent annealing further boosted the gain coefficient to 122.7 cm^-1.

Conclusions:

• The MCDSA method offers a scalable and high-quality approach for fabricating perovskite films for laser applications.
• Optimizing centrifugation cycles and incorporating solvent annealing are key to enhancing film characteristics and laser performance.
• This method provides a promising pathway for cost-effective, large-scale production of perovskite-based laser materials.