Self-Driven Photodetector and Ambipolar Transistor in Atomically Thin GaTe-MoS2 p-n vdW Heterostructure

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Atomically thin two-dimensional (2D) materials enable the creation of heterostructures with tunable electronic and optoelectronic properties.
• Fabricating atomically sharp interfaces is crucial for high-performance devices.

Purpose of the Study:

• To demonstrate an abrupt interface between dissimilar material systems, specifically GaTe-MoS2.
• To investigate the electronic and photoelectric properties of GaTe-MoS2 p-n heterojunction transistors.

Main Methods:

• Fabrication of GaTe-MoS2 p-n heterojunction transistors.
• Characterization of device transport properties under varying bias conditions.
• Evaluation of device performance under illumination to assess photoelectric characteristics.

Main Results:

• The GaTe-MoS2 heterostructure exhibits forward-biased rectifying behavior.
• Ambipolar transport is observed, with both electrons and holes contributing to conductivity.
• Under illumination, efficient separation of photoexcited electron-hole pairs generates self-driven photocurrent within 10 ms due to a large built-in potential.

Conclusions:

• Abrupt interfaces between dissimilar materials like GaTe and MoS2 facilitate efficient charge transfer.
• These heterostructures are promising for applications in photoswitches, photodetectors, and photovoltaic devices owing to their strong built-in potential.