Exploiting the Photoresponse in LiInP₂Se₆ for Image Processing.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Monolayer molybdenum disulfide (MoS₂) field-effect transistors (FETs) are crucial in 2D electronics.
• Investigating novel heterostructures is key to unlocking advanced functionalities.
• Understanding sub-bandgap excitation effects is vital for optoelectronic applications.

Purpose of the Study:

• To investigate the anomalous photoresponse of LiInP₂Se₆-gated MoS₂ FETs.
• To explore the potential of this heterostructure for image processing applications.
• To demonstrate gate-tunable persistent negative photoconductivity.

Main Methods:

• Fabrication of MoS₂/LiInP₂Se₆ heterostructures.
• Characterization of the photoresponse under varying light intensities.
• Demonstration of image contrast modulation using gate bias and light exposure time.

Main Results:

• Observed gate-tunable persistent negative photoconductivity in the MoS₂/LiInP₂Se₆ heterostructure.
• Photoresponse scales nonlinearly with incident light intensity.
• Demonstrated on-chip image contrast modulation by tuning gate bias and light exposure time.

Conclusions:

• LiInP₂Se₆ exhibits an anomalous photoresponse exploitable for image processing.
• The MoS₂/LiInP₂Se₆ heterostructure offers a novel platform for sensor-level contrast modulation.
• This work presents a compact route for elementary preprocessing functions in vision devices.