Highly Responsive and Self-Powered Photodetector Based on PtSe₂/MoS₂ Heterostructure

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Two-dimensional (2D) materials and heterostructures are promising for advanced optoelectronic devices.
• Developing high-performance, self-powered photodetectors is crucial for next-generation sensing technologies.

Purpose of the Study:

• To demonstrate a highly responsive, self-powered photodetector utilizing a PtSe2/MoS2 van der Waals heterostructure.
• To investigate the spectral response, photoresponsivity, and response time of the fabricated device.

Main Methods:

• Fabrication of a van der Waals heterostructure device using PtSe2 and MoS2 layers.
• Characterization of the device's photodetection performance under various wavelengths and illumination conditions.
• Evaluation of device performance in both externally biased and self-powered (zero bias) modes.

Main Results:

• Achieved a wide spectral response from visible (405 nm) to near-infrared (980 nm).
• Demonstrated remarkable photoresponsivity (4.52 A/W) and external quantum efficiency (1880%) at 405 nm with a fast response time (20 ms).
• Exhibited decent photoresponsivity (33.4 mA/W) at zero bias, confirming effective self-powered operation.

Conclusions:

• The PtSe2/MoS2 heterostructure is a highly effective platform for high-performance photodetectors.
• The demonstrated self-powered capability and broad spectral response position this device for various photodetection applications.
• This work highlights the potential of 2D material heterostructures in advancing optoelectronic device technology.