Nanoscale Engineering of Ladder-Like Polysilsesquioxane Dielectric Surfaces Enables High-Performance Flexible...

Area of Science:

• Materials Science
• Organic Electronics
• Nanotechnology

Background:

• High-performance flexible organic thin-film transistors (OTFTs) operating at low voltages are crucial for advanced electronic applications.
• Developing suitable dielectric materials is key to improving OTFT performance and stability.

Purpose of the Study:

• To design and synthesize a novel ladder-like polysilsesquioxane (LPSQ) dielectric with nanoscale functionalities.
• To enhance organic semiconductor (OSC) self-assembly and dielectric performance for low-voltage OTFTs.

Main Methods:

• Synthesized LPSQ dielectric with long alkyl chains and epoxy groups.
• Investigated the effect of alkyl chains on C10-DNTT crystallization and epoxy groups on dielectric polarization.
• Fabricated OTFTs and characterized their electrical properties, stability, and flexibility.
• Demonstrated solution-processed flexible logic circuits using the developed dielectric.

Main Results:

• Achieved ultralow interface trap density (6.00 × 10¹¹ cm^-2).
• Obtained record-high hole mobility (15.55 cm²/V·s) at 5 V.
• Demonstrated excellent OTFT stability (threshold shift < 1 V over 200 min) and flexibility.
• Successfully fabricated flexible logic circuits with high voltage gains (up to 37.2 at 5 V).

Conclusions:

• The novel LPSQ dielectric with tailored nanoscale functionalities significantly enhances OTFT performance.
• This molecular design strategy enables practical low-voltage flexible electronics and solution-processed logic circuits.