Synthesis of 2D ternary layered manganese phosphorous trichalcogenides towards ultraviolet photodetection

Manganese phosphorous selenium (MnPSe 3 ), as a representative of layered metal phosphorus trichalcogenides (MPTs), has gained significant attention due to its direct bandgap, high carrier mobility, large absorption coefficient, which indicate great potential in photoelectric application. Herein, high-quality two-dimensional (2D) MnPSe 3 flakes were mechanically exfoliated from the corresponding bulk crystals synthesized by chemical vapor transport (CVT) methods. The systematic investigation was applied to the lattice vibrations of MnPSe 3 via angle-resolved polarized Raman spectroscopy (ARPRS), and the Raman vibration modes were determined based on Raman selection rules and crystal symmetry. Impressively, the photodetectors based on 2D MnPSe 3 flakes exhibit excellent photoresponse to the ultraviolet light with a responsivity up to 22.7 A W −1 and a detectivity of 2.4 × 10 11 Jones. The high performance in the ultraviolet range signifies that 2D MnPSe 3 is expected to be a powerful candidate for future ultraviolet photodetection.