High rectification ratio metal-insulator-semiconductor tunnel diode based on single-layer MoS₂

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Single-layer molybdenum disulfide (MoS₂) is a promising 2D material for scaled-down transistors.
• Research has focused on MoS₂ synthesis and field-effect transistors, but diodes are less explored.
• Diodes are essential two-terminal electronic components for unidirectional current flow.

Purpose of the Study:

• To report a high rectification ratio metal-insulator-semiconductor (MIS) tunnel diode based on single-layer MoS₂.
• To demonstrate the potential of MoS₂ for fundamental electronic building blocks in 2D electronics.
• To investigate methods for fabricating efficient MoS₂-based diodes.

Main Methods:

• Fabrication of a two-terminal MIS tunnel diode using single-layer MoS₂.
• Formation of ohmic contact using Indium/Gold (In/Au) electrodes via thermal evaporation.
• Creation of the MIS tunneling structure using Silicon Nitride/Palladium/Gold (Si₃N₄/Pd/Au) electrodes via electron beam evaporation.

Main Results:

• Achieved a high current rectification ratio of up to 10⁷ at room temperature.
• Demonstrated control over quantum tunneling carrier density and tunneling barrier width for high rectification.
• Successfully fabricated the MoS₂ MIS tunnel diode using silicon technology-compatible evaporation methods.

Conclusions:

• The developed single-layer MoS₂ MIS tunnel diode exhibits excellent rectification properties.
• This device shows significant potential as a fundamental component for future two-dimensional (2D) electronic circuits.
• The fabrication method is compatible with existing silicon technology, paving the way for practical applications.