Ultraviolet photodetector based on RbCu2I3 microwire

Copper-based halide perovskites have shown great potential in lighting and photodetection due to their excellent photoelectric properties, good stability and lead-free nature. However, as an important piece of copper-based perovskites, the synthesis and application of RbCu2I3 have never been reported. Here, we demonstrate the synthesis of high-quality RbCu2I3 microwires (MWs) by a fast-cooling hot saturated solution method. The prepared MWs exhibit an orthorhombic structure with a smooth surface. Optical measurements show the RbCu2I3 MWs have a sharp ultraviolet absorption edge with 3.63 eV optical band gap and ultra-large stokes shift (300 nm) in photoluminescence. The subsequent photodetector based on a single RbCu2I3 MW shows excellent ultraviolet detection performance. Under the 340 nm illumination, the device shows a specific detectivity of 5.0 x 10(9) Jones and a responsivity of 380 mA center dot W-1. The synthesis method and physical properties of RbCu2I3 could be a guide to the future optoelectronic application of the new material.

Automated summary

High-quality RbCu2I3 microwires were successfully synthesized by a fast-cooling hot saturated solution method. The microwires exhibited an orthorhombic structure with a smooth surface. Optical measurements showed sharp ultraviolet absorption and ultralarge Stokes shift (300 nm) in photoluminescence of RbCu2I3 microwires. The photodetector based on a single RbCu2I3 microwire demonstrated excellent ultraviolet detection performance, with a specific detectivity of 5.0 x 10(9) Jones and a responsivity of 380 mA center dot W-1. The synthesis method and physical properties of RbCu2I3 can guide the future optoelectronic application of this new material.