Stable Copper Phosphorus Iodide (Cu₂P₃I₂) Nano/Microwire Photodetectors

Abstract Crystalline Cu₂P₃I₂ nano‐ and microwires with high purity were synthesized through a chemical vapor transport method in evacuated silica ampoules using copper(I) iodide and red phosphorus as precursors for potential applications as photodetectors. Single‐wire field‐effect transistors (FET) were built to study their electronic and optoelectronic properties. The wires exhibit a p‐type semiconducting behavior with an electron mobility of 31.6 cm² V⁻¹ s⁻¹ and I_ON/I_OFF ratio of 10³. The photodetectors are highly reproducible and stable with a short response time (40–70 ms).