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

Manganese phosphorous selenium (MnPSe3), 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) MnPSe3 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 MnPSe3via 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 MnPSe3 flakes exhibit excellent photoresponse to the ultraviolet light with a responsivity up to 22.7 A W−1 and a detectivity of 2.4 × 1011 Jones. The high performance in the ultraviolet range signifies that 2D MnPSe3 is expected to be a powerful candidate for future ultraviolet photodetection.