Isomerically pure syn-anthradithiophenes: synthesis, properties, and FET performance

Area of Science:

• Organic Chemistry
• Materials Science
• Solid-State Physics

Background:

• Anthradithiophene (ADT) derivatives are key organic semiconductors.
• Controlling isomeric purity is crucial for predictable material properties and device performance.

Purpose of the Study:

• To describe the synthesis of isomerically pure syn-anthradithiophene (syn-ADT) derivatives.
• To investigate the solid-state packing of pure syn-ADTs versus mixed isomers.
• To evaluate the performance of organic field-effect transistors (OFETs) based on these materials.

Main Methods:

• Synthesis of syn-anthradithiophene derivatives.
• X-ray crystallography for solid-state structure analysis.
• Fabrication and characterization of single-crystal organic field-effect transistors (OFETs).

Main Results:

• Isomerically pure syn-ADT derivatives (2a,b) were successfully synthesized.
• X-ray crystallography revealed distinct solid-state arrangements for pure syn-ADTs compared to mixed isomers.
• OFETs fabricated with pure syn-ADTs exhibited performance comparable to those using mixed ADT isomers, with mobilities reaching 1 cm²/Vs.

Conclusions:

• Isomerically pure syn-ADTs can be synthesized and effectively utilized in organic electronics.
• The performance of OFETs is not significantly diminished by using isomerically pure materials compared to mixtures.
• These findings support the development of well-defined organic semiconductor materials for advanced electronic devices.