Large-scale two-dimensional MoS₂ photodetectors by magnetron sputtering

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Two-dimensional materials like molybdenum disulfide (MoS2) offer unique electronic and optical properties.
• Developing large-scale, uniform MoS2 films is crucial for practical device applications.
• Existing photodetectors often face limitations in performance and scalability.

Purpose of the Study:

• To demonstrate photodetectors fabricated using large-scale, two-dimensional molybdenum disulfide (MoS2).
• To investigate the impact of precise MoS2 thickness control on photodetector performance.
• To compare the performance of MoS2 photodetectors with those based on other fabrication methods.

Main Methods:

• Utilized magnetron sputtering synthesis for large-scale MoS2 film fabrication.
• Achieved precise control over MoS2 film thickness, down to a single monolayer (~0.75nm).
• Integrated five MoS2 monolayers into photodetector devices for performance evaluation.

Main Results:

• Photodetectors with five MoS2 monolayers exhibited high photoresponsivity (1.8 A/W).
• Achieved an external quantum efficiency exceeding 260% at 850 nm wavelength.
• Demonstrated a high photodetectivity of approximately 5 x 10^8 Jones.
• Outperformed photodetectors based on mechanically exfoliated MoS2.

Conclusions:

• Magnetron sputtering enables the production of high-quality, large-scale MoS2 films for optoelectronics.
• MoS2-based photodetectors fabricated via sputtering show promising performance metrics.
• This work highlights the potential of MoS2 for next-generation photodetector technologies.