High Performance Solution Processed Organic Field Effect Transistors with Novel Diketopyrrolopyrrole-Containing Small...

Area of Science:

• Materials Science
• Organic Electronics
• Semiconductor Physics

Background:

• Organic field-effect transistors (OFETs) are crucial for flexible electronics.
• Developing high-performance, solution-processable organic semiconductors is essential.
• Diketopyrrolopyrrole (DPP)-based small molecules offer tunable electronic properties.

Purpose of the Study:

• Synthesize and characterize novel DPP-based small molecules (LGC-D117 and LGC-D118).
• Investigate the impact of different side chains on OFET performance.
• Evaluate the potential for high-mobility organic semiconductors in solution-processable devices.

Main Methods:

• Synthesis of DPP-based small molecules with varying side chains (LGC-D117 and LGC-D118).
• Fabrication and characterization of solution-processable organic field-effect transistors (OFETs).
• Analysis of molecular structure, crystallinity, and charge transport properties.

Main Results:

• Both molecules feature silaindacenodithiophene donor units and DPP linkers.
• LGC-D118, with siloxane-terminated side chains, exhibits enhanced crystallinity.
• LGC-D118 achieves a maximum field-effect mobility of 3.04 cm² V⁻¹ s⁻¹.
• High mobility is maintained in 2-methyltetrahydrofuran with low-temperature annealing.

Conclusions:

• Siloxane side chains significantly improve the crystallinity and charge mobility of DPP-based semiconductors.
• LGC-D118 demonstrates excellent solubility and high performance in environmentally friendly solvents.
• These findings pave the way for high-performance, solution-processable organic electronics.