Inkjet-Printed, High-Performance MoS₂ Transistors and Unipolar Logic Electronics.

Area of Science:

• Materials Science
• Electronics Engineering
• Nanotechnology

Background:

• Two-dimensional (2D) semiconductor field-effect transistors offer flexibility and high carrier mobility, ideal for wearable electronics and smart sensors.
• Large-area solution processing of 2D semiconductors is hindered by high interflake resistance in film transistors.
• Overcoming interflake resistance is crucial for realizing practical applications of 2D thin film transistors.

Purpose of the Study:

• To develop a fabrication method for high-performance 2D semiconductor thin film transistors using solution processing.
• To investigate and optimize intraflake carrier transport in 2D transistors.
• To demonstrate the feasibility of integrated logic circuits using these high-performance transistors.

Main Methods:

• Fabrication of inkjet-printed sub-20 nm channel electrolyte-gated transistors with a narrow-channel, near-vertical transport architecture.
• Passivation of sulfur vacancies via tailored surface treatment to enhance transistor performance.
• Integration of transistors into unipolar depletion-load-type inverters and logic gates (NAND, NOR, OR).

Main Results:

• Achieved predominantly intraflake carrier transport, bypassing high interflake resistance.
• Demonstrated high current density (280 μA·μm^-1) and an On-Off current ratio exceeding 1 × 10⁷ with a low subthreshold swing (100 mV·decade^-1).
• Fabricated inverters with a maximum gain of 31 and logic gates operating at 1 kHz.

Conclusions:

• The developed device architecture and surface treatment enable high-performance 2D thin film transistors through solution processing.
• This work represents a significant advancement towards the realization of electronic circuits based on printed 2D thin film transistors.
• The findings pave the way for scalable manufacturing of flexible and wearable electronic devices.