Plasmonic MXene Nanoparticle-Enabled High-Performance Two-Dimensional MoS 2 Photodetectors.

Two-dimensional (2D) molybdenum disulfide (MoS 2 ) has emerged as a prospective candidate for photodetection. However, due to the surface defects formed during the synthesis, the low photoresponse of 2D MoS 2 photodetectors restricts its practical applications. Here, we developed a hybrid plasmonic structure that integrates MXene nanoparticles (MNPs) and 2D MoS 2 . With the introduction of MNPs, light waves are concentrated on MoS 2 nanosheets via a strong localized surface plasmon resonance. Consequently, MNPs-decorated MoS 2 photodetectors exhibit an improved photoresponse, including a higher responsivity (20.67 A/W), a larger detectivity of 5.39 × 10 12 Jones, and a maximum external quantum efficiency of over 5000%. A 150-fold enhanced detectivity (2.33 × 10 12 Jones) was achieved under 635 nm light illumination in the optimized device. These results provide an alternative approach for improving the photoresponse of MoS 2 photodetectors.