2D Ruddlesden-Popper Perovskite Sensitized SnP2S6 Ultraviolet Photodetector Enabling Excessive Responsivity and Quick Velocity



Because the newly developed wide-bandgap semiconductors, two-dimensional layered metallic phosphorus chalcogenides (2D LMPCs) exhibit monumental potential purposes in ultraviolet (UV) photodetection on account of their superior optoelectronic efficiency. Nonetheless, 2D LMPCs-based UV photodetectors usually endure from low responsivity and gradual response pace, which hinder their sensible purposes. Right here, we current an efficient technique of sensitizing 2D LMPCs UV photodetectors with 2D Ruddlesden-Popper (RP) perovskite to allow excessive responsivity and quick response pace. As an indication, a hybrid heterojunction composing of RP perovskite (PEA)2PbI4 and 2D SnP2S6 flake is fabricated by spin-coating. Benefitting from the sturdy optical absorption of (PEA)2PbI4 and the environment friendly interfacial cost switch brought on by the favorable type-Ⅱ power band alignment, the as-fabricated 2D SnP2S6/(PEA)2PbI4 hybrid heterojunction photodetectors present excessive responsivity (67.1 A W-1), massive detectivity (2.8 × 1011 Jones), quick rise/delay time (30/120 μs) and wonderful exterior quantum effectivity (22825 %) at 365 nm. Underneath field-effect modulation, the responsivity of the heterojunction photodetector can attain as much as 239.4 A W-1, which is attributed to the photogating mechanism and diminished Schottky obstacles. Owing to the superb photodetection efficiency, the heterojunction gadget additional guarantees the superior imaging functionality. This work supplies an efficient technique for designing high-performance UV photodetectors towards future purposes