CsPbBr₃ and Cs₂AgBiBr₆ Composite Thick Films with Potential Photodetector Applications.

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Perovskite materials are crucial for optoelectronic applications.
• Developing lead-free alternatives is essential for environmental safety.
• Composite materials offer enhanced properties for device fabrication.

Purpose of the Study:

• To investigate the optoelectronic properties of CsPbBr₃ and Cs₂AgBiBr₆ perovskites in composite thick films.
• To evaluate the influence of a poly(butyl methacrylate) matrix on perovskite composite performance.
• To assess the potential of these composites for photodetector applications.

Main Methods:

• Synthesis of composite thick films using mechanochemical and hot press methods.
• Characterization via X-ray diffraction (XRD), Raman spectroscopy, SEM, UV-Vis, and photoluminescence (PL).
• Evaluation of photocurrent and photon detection capabilities.

Main Results:

• The polymer matrix influenced grain size and surface area, enhancing charge transfer without altering crystalline structure.
• CsPbBr₃ exhibited higher photocurrent due to superior charge carrier mobility.
• Both composites displayed photoconductive behavior; Cs₂AgBiBr₆ showed X-ray detection capabilities.

Conclusions:

• Perovskite-polymer composites show potential for advanced photodetector applications.
• CsPbBr₃ composites offer high performance in visible light detection.
• Cs₂AgBiBr₆ composites provide a lead-free, environmentally conscious option for photon detection.