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Field-Programmable Bimodal Switching in a Hybrid-Dual-Gated MoS₂ Transistor.

Jaeeun Kwon¹, Hanbin Cho², Kyungmin Ko²

¹Graduate School of Semiconductor Materials and Devices Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea.

|July 23, 2025

Summary

Researchers developed a novel hybrid-dual-gated switch on a molybdenum disulfide (MoS₂) transistor. This device enables two distinct switching modes for advanced molecular interactions and tunable electronic properties.

Keywords:

Bimodal transistor Electrical double layer transistor Hybrid-dual-gating Intercalation Phase transition Two-dimensional materials

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Area of Science:

Materials Science
Nanotechnology
Solid-State Physics

Background:

Van der Waals solids possess high surface-to-volume ratios and tunable interlayer spacing, facilitating strong interactions with foreign molecules.
Controlling multiple molecular interactions on an integrated platform is a significant challenge in materials science.

Purpose of the Study:

To introduce a novel hybrid-dual-gated voltage-controlled bimodal switch.
To demonstrate tunable host-guest interactions on a single molybdenum disulfide (MoS₂) transistor platform.

Main Methods:

Cointegration of high-κ solid and ionic liquid electrolytes as dual-gate dielectrics on a single MoS₂ transistor.
Synchronized dual-gate voltage application to induce distinct switching modes.
Incorporation of conformal electrode passivation for device stability.

Main Results:

Achieved two interchangeable switching modes: electrostatic near-Boltzmann-limit switching and intercalation-driven metal-insulator transitions.
Demonstrated enhanced field-effect switching performance (Ion/Ioff ∼ 10⁹, SS_min ∼ 61 mV/dec) in the low-gate voltage regime.
Observed steep-slope metal-insulator transitions with 2H-to-1T structural alternations in the high-gate voltage regime.

Conclusions:

The hybrid-dual-gated switch platform enables stable, field-tunable bimodal switching.
The device facilitates broad-range host-guest interactions through independent dual-gating modulation.
This integrated platform offers a promising approach for advanced molecular sensing and electronic applications.