Ultraviolet photodetector based on RbCu₂I₃microwire

Area of Science:

• Materials Science
• Solid-State Physics
• Optoelectronics

Background:

• Copper-based halide perovskites offer lead-free alternatives with excellent optoelectronic properties.
• The specific material RbCu2I3 has not been previously synthesized or studied.

Purpose of the Study:

• To synthesize high-quality RbCu2I3 microwires (MWs).
• To investigate the structural, optical, and photoelectric properties of RbCu2I3 MWs.
• To explore the application of RbCu2I3 MWs in ultraviolet photodetection.

Main Methods:

• Synthesis of RbCu2I3 MWs via a fast-cooling hot saturated solution method.
• Structural characterization using X-ray diffraction.
• Optical property analysis including absorption and photoluminescence spectroscopy.
• Fabrication and testing of a single-microwire photodetector.

Main Results:

• High-quality RbCu2I3 MWs with an orthorhombic structure were successfully synthesized.
• The material exhibits a sharp UV absorption edge (3.63 eV band gap) and an ultra-large Stokes shift (300 nm).
• The fabricated photodetector demonstrated excellent UV detection performance with a specific detectivity of 5.0 × 10^9 Jones and responsivity of 380 mA·W^-1 at 340 nm.

Conclusions:

• The fast-cooling method is effective for synthesizing high-quality RbCu2I3 MWs.
• RbCu2I3 possesses promising optoelectronic properties for UV applications.
• This work provides a foundation for future research and development of RbCu2I3 in optoelectronics.