Random lasing in cesium lead iodide (CsPbI₃) thin films with no surface passivation

Area of Science:

• Materials Science
• Optics and Photonics
• Solid-State Physics

Background:

• Perovskite materials offer unique optoelectronic properties.
• Cesium lead iodide (CsPbI3) is a promising material for optoelectronic applications.
• Achieving stable room-temperature lasing is crucial for device development.

Purpose of the Study:

• To report room-temperature random lasing in CsPbI3 thin films.
• To investigate the lasing characteristics and stability of CsPbI3.
• To explore the potential of CsPbI3 for laser applications.

Main Methods:

• Chemical deposition of CsPbI3 thin films.
• Characterization of crystalline quality and photoluminescence (PL) emission.
• Analysis of lasing spectra at various angles to confirm random lasing.
• Fast Fourier Transform (FFT) analysis for effective cavity length determination.
• Assessment of lasing stability over a large number of laser shots.

Main Results:

• CsPbI3 thin films with high crystalline quality were successfully fabricated.
• Intense PL emission and lasing behavior with a Q-factor > 7000 were observed.
• Lasing was confirmed as random lasing through spectral analysis.
• Effective cavity length was determined using FFT analysis.
• Exceptional lasing stability exceeding 4.8 x 10^5 shots in air was achieved.

Conclusions:

• CsPbI3 thin films are suitable for achieving stable room-temperature random lasing.
• The chemical deposition method provides a viable route for fabricating high-quality CsPbI3 films for lasing.
• The demonstrated stability and performance highlight the potential of CsPbI3 in optoelectronic devices.