A Solution Processable Dithioalkyl Dithienothiophene (DSDTT) Based Small Molecule and Its Blends for High Performance...

Area of Science:

• Materials Science
• Organic Electronics
• Semiconductor Physics

Background:

• Small molecular semiconductors are crucial for developing advanced organic field-effect transistors (OFETs).
• Thiophene-based materials offer tunable electronic properties for semiconductor applications.

Purpose of the Study:

• To synthesize and characterize a novel 3,5-dithiooctyl dithienothiophene based small molecular semiconductor (DDTT-DSDTT).
• To evaluate the performance of DDTT-DSDTT in organic field-effect transistors (OFETs) and explore blend formulations.

Main Methods:

• Synthesis and characterization of DDTT-DSDTT.
• Investigation of thermal, optical, electrochemical, and electronic structural properties.
• Fabrication and testing of OFET devices using solution-shearing deposition and blend films (DDTT-DSDTT/PαMS).

Main Results:

• DDTT-DSDTT exhibits a planar core with intramolecular S-S locks (3.10 Å).
• Achieved a record hole mobility of 3.19 cm² V⁻¹ s⁻¹ in solution-processed OFETs using anisole.
• Blend films (50% DDTT-DSDTT/PαMS) showed a hole mobility of 2.44 cm² V⁻¹ s⁻¹ with improved gate bias stress stability.

Conclusions:

• DDTT-DSDTT is a high-performance all-thiophene semiconductor for OFETs.
• Solution-processing and blend formulations offer pathways to enhanced device performance and stability.