Nonvolatile MoTe₂ p-n Diodes for Optoelectronic Logics.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Atomically thin p-n junctions are crucial for miniaturized electronic and photonic devices.
• On-chip optoelectronics require efficient and compact device architectures.

Purpose of the Study:

• To construct lateral nonvolatile MoTe2 p-n diodes using a MoTe2/h-BN/graphene semifloating gate field-effect transistor (SFG-FET) configuration.
• To investigate the rectifying and photovoltaic properties of these diodes.
• To explore their potential for logic optoelectronic devices.

Main Methods:

• Fabrication of MoTe2/h-BN/graphene heterostructures.
• Utilizing a semifloating gate field-effect transistor (SFG-FET) architecture.
• Characterization of electrical and photovoltaic properties.
• Demonstration of erasable p-n junction behavior and logic gate functionalities.

Main Results:

• Achieved excellent rectifying behavior with a rectification ratio up to 8 × 10^3.
• Observed typical photovoltaic properties with a power conversion efficiency of 0.5%.
• Demonstrated erasable and programmable rectifying and photovoltaic properties by manipulating stored charges.
• Successfully developed logic optoelectronic devices, including AND and OR optical logic gates.

Conclusions:

• The developed MoTe2-based SFG-FET devices exhibit nonvolatile, erasable p-n junction characteristics.
• These devices offer promising functionalities for advanced logic optoelectronic applications.
• The findings contribute to the development of modern photoelectrical interconnected circuits.