Thermally tunable anti-ambipolar heterojunction devices

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Two-dimensional (2D) materials and van der Waals heterostructures are key for novel electronic devices due to unique photonic and electronic properties.
• Anti-ambipolar devices, with their nonlinear electrical behavior, are promising for multi-state logic applications.

Purpose of the Study:

• To construct and characterize an anti-ambipolar heterojunction device using few-layer As_0.4P_0.6 and PdSe₂.
• To investigate the temperature-dependent electrical properties and tunability of the anti-ambipolar device.

Main Methods:

• Fabrication of a heterojunction device using few-layer As_0.4P_0.6 and PdSe₂.
• Electrical characterization of the device at various temperatures (80 K to 330 K).
• Analysis of peak voltage (V_peak) and peak-to-valley ratio (PVR) under different conditions.

Main Results:

• The device demonstrated anti-ambipolar behavior with a peak voltage (V_peak) of -3 V and a peak-to-valley ratio (PVR) of ~8 × 10³ at 300 K.
• The PVR was found to be tunable by bias voltage.
• Significant thermal tunability was observed, with a large V_peak of ~-16 V at 330 K and a PVR exceeding 10⁸ at 80 K.

Conclusions:

• The fabricated anti-ambipolar heterojunction device exhibits significant temperature-dependent characteristics.
• The device's tunable properties and high PVR at low temperatures suggest potential for advanced applications requiring thermal sensitivity.