Terazulene: a high-performance n-type organic field-effect transistor based on molecular orbital distribution control

Area of Science:

• Organic electronics
• Materials science
• Semiconductor physics

Background:

• Organic field-effect transistors (OFETs) are crucial for flexible electronics.
• Developing high-performance n-type organic semiconductors remains a challenge.
• Azulene-based systems offer unique electronic properties due to their non-alternant structure.

Purpose of the Study:

• To synthesize and characterize a linear expanded π-conjugation system based on azulene units.
• To investigate the charge transport properties of the novel molecule, 2,6′:2′,6″-terazulene.
• To explore the relationship between molecular orbital distribution and transistor performance.

Main Methods:

• Synthesis of 2,6′:2′,6″-terazulene.
• Fabrication and characterization of OFET devices.
• Computational analysis of molecular orbitals (HOMO/LUMO).

Main Results:

• 2,6′:2′,6″-terazulene exhibits excellent n-type transistor performance.
• Electron mobility up to 0.29 cm(2) V(-1) s(-1) was achieved.
• Lowest unoccupied molecular orbital (LUMO) delocalization and highest occupied molecular orbital (HOMO) localization were observed, favoring n-type transport.

Conclusions:

• The study introduces a new class of azulene-based organic semiconductors.
• Molecular orbital distribution control is a viable strategy for tuning OFET polarity.
• 2,6′:2′,6″-terazulene demonstrates significant potential for n-type organic electronic applications.