Plasmonic MXene Nanoparticle-Enabled High-Performance Two-Dimensional MoS₂ Photodetectors.

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Two-dimensional molybdenum disulfide (MoS2) shows promise for photodetection.
• Surface defects in MoS2 limit the photoresponse of photodetectors.
• Improving photoresponse is crucial for practical applications of MoS2-based devices.

Purpose of the Study:

• To develop a hybrid plasmonic structure integrating MXene nanoparticles (MNPs) with 2D MoS2.
• To enhance the photoresponse of MoS2 photodetectors by leveraging localized surface plasmon resonance.
• To investigate the performance improvements in responsivity, detectivity, and external quantum efficiency.

Main Methods:

• Fabrication of a hybrid structure combining 2D MoS2 and MNPs.
• Utilizing localized surface plasmon resonance of MNPs to concentrate light on MoS2.
• Characterization of photodetector performance, including responsivity and detectivity.

Main Results:

• The hybrid MNPs-MoS2 photodetector demonstrated significantly improved photoresponse.
• Achieved a high responsivity of 20.67 A/W and detectivity of 5.39 × 10^12 Jones.
• Reached a maximum external quantum efficiency exceeding 5000% and a 150-fold detectivity enhancement under 635 nm illumination.

Conclusions:

• The integration of MNPs with 2D MoS2 offers an effective strategy to enhance photodetector performance.
• The hybrid plasmonic structure overcomes limitations associated with MoS2 surface defects.
• This approach provides a viable pathway for developing high-performance MoS2-based photodetectors.