Low-temperature, high-performance solution-processed metal oxide thin-film transistors formed by a ‘sol–gel on chip’...

Area of Science:

• Materials Science
• Electronics Engineering
• Semiconductor Physics

Background:

• No ideal thin-film transistor technology combines low-temperature, solution-processable organic semiconductors with high performance for displays.
• N-type amorphous mixed metal oxides offer high mobility, stability, and transparency but are typically sputter-deposited.
• A need exists for high-performance mixed oxide materials formed from solution at low process temperatures (<250°C).

Purpose of the Study:

• To develop a solution-processable, low-temperature fabrication method for high-performance amorphous metal oxide thin-film transistors.
• To achieve high field-effect mobilities and stable operational characteristics in these devices.

Main Methods:

• Utilized a ‘sol–gel on chip’ hydrolysis approach with soluble metal alkoxide precursors.
• Formed amorphous metal oxide semiconducting thin-films at maximum process temperatures as low as 230°C.

Main Results:

• Achieved unprecedented high field-effect mobilities of 10 cm² V⁻¹ s⁻¹.
• Demonstrated reproducible and stable turn-on voltages (Von ≈ 0 V).
• Exhibited high operational stability in the fabricated thin-film transistors.

Conclusions:

• The developed sol-gel method provides a viable route for fabricating high-performance amorphous metal oxide thin-film transistors at low temperatures.
• This technology addresses the limitations of current thin-film transistor options for demanding display applications.
• Ionic mixed metal oxides are promising candidates for solution-processable, high-mobility amorphous semiconductor applications.