Phosphorene/rhenium disulfide heterojunction-based negative differential resistance device for multi-valued logic

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanotechnology

Background:

• Negative differential resistance (NDR) devices exhibit unique current-voltage characteristics with multiple threshold voltages.
• These properties make NDR devices promising for multi-valued logic applications, offering advantages over binary systems.
• Two-dimensional (2D) material heterojunctions are actively researched for novel electronic functionalities.

Purpose of the Study:

• To demonstrate a novel NDR device based on a phosphorene/rhenium disulfide (BP/ReS2) heterojunction.
• To investigate the carrier transport mechanisms within the BP/ReS2 NDR device.
• To explore the potential of this heterojunction for multi-valued logic applications.

Main Methods:

• Fabrication of a BP/ReS2 heterojunction exhibiting type-III broken-gap band alignment.
• Experimental characterization of the device's current-voltage (I-V) properties at various temperatures.
• Analysis of carrier transport mechanisms using tunneling and diffusion current models.
• Demonstration of a ternary inverter utilizing the NDR device.

Main Results:

• The BP/ReS2 heterojunction demonstrated high peak-to-valley current ratios (PVCR) of 4.2 at room temperature and 6.9 at 180 K.
• Detailed analysis revealed the interplay of tunneling and diffusion currents governing the NDR behavior.
• A functional ternary inverter was successfully implemented, showcasing multi-valued logic capability.

Conclusions:

• The developed BP/ReS2 heterojunction is a viable candidate for high-performance NDR devices.
• Understanding the carrier transport mechanism is crucial for optimizing NDR device design.
• This work represents a significant advancement in 2D material-based heterojunctions for future multi-valued logic devices.