Construction and Multifunctional Photonic Applications of Light Absorption-Enhanced Silicon-Based Schottky Coupled...

Area of Science:

• Optoelectronics
• Materials Science
• Nanotechnology

Background:

• Silicon (Si)-based photodetectors face challenges in light absorption efficiency and carrier lifetime.
• Graphene photodetectors require enhancements for improved performance.

Purpose of the Study:

• To develop a novel Si-based photodetector with enhanced detection capabilities.
• To address low light absorption efficiency and short carrier lifetime in Si-based graphene photodetectors.
• To investigate the synergistic effects of 3D-graphene and MoS2 QDs on optoelectronic performance.

Main Methods:

• In situ growth of 3D-graphene and molybdenum disulfide quantum dots (MoS2 QDs) on Si substrates.
• Utilized chemical vapor deposition (CVD) and plasma-enhanced chemical vapor deposition (PECVD) techniques.
• Fabricated a Si-based Schottky coupled structure.

Main Results:

• Validated a "dual-enhanced absorption" effect, improving optoelectronic mechanisms.
• Synergistic effects of 3D-graphene and MoS2 QDs enhanced light absorption and carrier lifetime.
• Achieved a wideband light response from 380-2200 nm with responsivity of 40 mA/W and detectivity of 1.15 × 10^9 Jones at 2200 nm.
• Demonstrated signal processing, logic operations (AND/OR gates), and image sensing capabilities.

Conclusions:

• The novel Si-based photodetector exhibits superior performance due to the combined effects of 3D-graphene and MoS2 QDs.
• The developed photodetector shows potential for advanced applications including signal processing and image sensing.
• This work advances the understanding of graphene-based photodetector mechanisms and performance enhancement.