Optimization of CsPbBr₃/PVDF composite for enhanced UV photodetection application

Area of Science:

• Materials Science
• Solid-State Chemistry
• Optoelectronics

Background:

• Halide perovskites are crucial for innovative materials.
• Their unique properties drive advancements in optoelectronics.
• Controlling their structure is vital for performance.

Purpose of the Study:

• Synthesize caesium lead bromide perovskites and PVDF composites.
• Investigate the impact of Cs/Pb molar ratios on structural and optoelectronic properties.
• Develop efficient UV-photodetectors and light-emitting materials.

Main Methods:

• Synthesis of caesium lead bromide perovskites with varying Cs/Pb molar ratios.
• Fabrication of perovskite/polyvinylidene fluoride (PVDF) composites via spin-coating.
• Structural characterization using X-ray diffraction (XRD).
• Evaluation of UV-photodetection and photoluminescence properties.

Main Results:

• Perovskite/PVDF composites showed oriented XRD peaks along the c-axis.
• Homogeneous distribution of perovskite microcrystals within the PVDF matrix was observed.
• The composite with a Cs/Pb ratio of 3/1 exhibited the highest green emission intensity.
• This optimized composite demonstrated the highest UV photo-responsivity in a UV-photodetector.

Conclusions:

• Structural modulation significantly influences the optoelectronic properties of halide perovskites.
• Additive manufacturing techniques are effective for tailoring perovskite-based materials.
• Optimized caesium lead bromide perovskite/PVDF composites show promise for UV-photodetection and light-emitting applications.