Perpendicular sheet-like alignment of a self-driven MoS₂/Si heterostructure for Vis-NIR wavelength detection

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Molybdenum disulfide (MoS2) and silicon (Si) heterostructures are promising for optoelectronic applications.
• Developing self-powered photodetectors is crucial for energy-efficient sensing technologies.

Purpose of the Study:

• To fabricate and characterize a self-powered heterostructure based on perpendicularly aligned n-MoS2/p-Si.
• To evaluate its performance for visible-near-infrared (Vis-NIR) wavelength detection.

Main Methods:

• MoS2 sheet-like morphology was achieved via hydrothermal treatment at 180 °C and 240 °C.
• Fabrication of n-MoS2/p-Si heterostructures.
• Characterization of electrical and photoresponse properties.

Main Results:

• The MoS2/Si heterostructure exhibited self-powered operation with a high photocurrent/dark current ratio (~10^3) at zero bias.
• Achieved wide-ranging Vis-NIR photoresponsivity with a peak value of 0.36 mA W^-1 at 625 nm.
• Demonstrated fast response and recovery times (0.176-0.185 s).

Conclusions:

• The fabricated MoS2/Si heterostructure is a viable self-powered photodetector for Vis-NIR wavelengths.
• The device's performance, including fast response and high photoresponsivity, highlights its potential for advanced optical sensing applications.
• Hydrothermal treatment conditions influence MoS2 morphology and device characteristics.