Flexible self-powered MoS₂/LaVO₃photodetector enhanced by graphene quantum dots interlayer

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Self-powered photodetectors (PDs) are crucial for efficient optoelectronic devices without external power.
• Flexible electronics demand robust and high-performance sensing components.

Purpose of the Study:

• To develop and characterize a flexible MoS2/graphene quantum dots (GQDs)/LaVO3 heterojunction photodetector.
• To evaluate the impact of a GQDs interlayer on device performance and stability.

Main Methods:

• Fabrication of a MoS2/GQDs/LaVO3 heterojunction PD on a polyethylene terephthalate substrate.
• Systematic performance evaluation with and without the GQDs interlayer.
• Mechanical bending tests to assess device stability.

Main Results:

• The MoS2/GQDs/LaVO3 PD demonstrated suppressed charge recombination compared to devices without GQDs.
• Significant improvements in responsivity, external quantum efficiency, and detectivity were observed with GQDs.
• The device maintained stable performance after 3000 bending cycles, indicating excellent mechanical stability.

Conclusions:

• The incorporation of GQDs in MoS2/LaVO3 heterojunctions substantially enhances photodetector performance.
• The flexible MoS2/GQDs/LaVO3 PD exhibits promising potential for next-generation flexible optoelectronic applications.
• The developed photodetector offers a viable solution for self-powered, durable optoelectronic systems.