Multi-Bit Analog Transmission Enabled by Electrostatically Reconfigurable Ambipolar and Anti-Ambipolar Transport

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanotechnology

Background:

• Two-dimensional (2D) materials enable analog applications like phase switching via ambipolar or anti-ambipolar transport.
• Limited to a single transport mode, the scope of these applications is restricted.
• Developing devices with tunable transport properties is crucial for expanding functionality.

Purpose of the Study:

• To demonstrate electrostatically reconfigurable and tunable ambipolar and anti-ambipolar transport in a single field-effect transistor (FET).
• To explore the device's capability in generating diverse analog output signals under varying conditions.
• To evaluate different data transmission schemes based on the device's transport modes for optimal performance.

Main Methods:

• Fabrication of a field-effect transistor using a photoactive ambipolar WSe2 channel.
• Utilizing gate-controlled channel and Schottky barriers for electrostatic reconfiguration of transport modes.
• Generating in-phase, out-of-phase, and double-frequency sinusoidal signals under dark and illumination.
• Implementing 2- and 3-bit data transmission schemes (phase, frequency, amplitude modulation).
• Evaluating performance metrics including power consumption, error probability, and complexity.

Main Results:

• Successful demonstration of electrostatically reconfigurable ambipolar and anti-ambipolar transport in the same WSe2 FET.
• Generation of distinct sinusoidal output signals (in-phase, out-of-phase, double-frequency) modulated by light.
• Realization of 2- and 3-bit data transmission using phase, frequency, and amplitude modulation schemes.
• Identification of optimal transmission schemes by analyzing power consumption, error probability, and complexity.
• Performance enhancement observed in a dual-metal contact transistor design with improved linearity.

Conclusions:

• The developed FET architecture offers a versatile platform for analog signal processing by enabling switchable ambipolar and anti-ambipolar transport.
• The ability to tune transport modes is critical for optimizing data transmission performance in terms of power, errors, and complexity.
• The generic device design is adaptable to other ambipolar materials, paving the way for broader applications in tunable electronic devices.