Micro-Hall Sensors Based on Two-Dimensional Molybdenum Diselenide.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Two-dimensional (2D) semiconductors offer unique electronic properties for advanced devices.
• Micro-Hall sensors are crucial for magnetic field detection.

Purpose of the Study:

• To investigate the potential of two-dimensional molybdenum diselenide (MoSe₂) for micro-Hall sensor applications.
• To characterize the magnetic sensing performance of MoSe₂-based devices.

Main Methods:

• Fabrication of micro-Hall sensor structures using Ti/MoSe₂/Ti and Au/MoSe₂/Au configurations.
• Measurement of Hall voltage response to varying magnetic fields.
• Analysis of magnetic sensitivity and minimum detectable magnetic field.

Main Results:

• The Ti/MoSe₂/Ti sensor exhibited a linear Hall voltage response with a sensitivity of ~16 V/AT.
• The Au/MoSe₂/Au sensor achieved a higher sensitivity of ~120 V/AT at 100 mA bias current.
• A minimum detectable magnetic field of 1.45 μT/√Hz was achieved with the Au/MoSe₂/Au sensor.

Conclusions:

• Two-dimensional molybdenum diselenide is a promising material for high-performance micro-Hall sensors.
• The developed MoSe₂-based sensors show excellent potential for sensitive magnetic field detection applications.