Dithienylthiazolothiazole with B ← N Bond toward Electron-Deficient BN Embedded Polycyclic Heteraromatic Molecule

Area of Science:

• Materials Science
• Organic Electronics
• Supramolecular Chemistry

Background:

• Developing novel organic semiconductors is crucial for advancing electronic devices.
• Electron-deficient units are essential for creating n-type organic semiconductors.
• Boron-nitrogen (BN) incorporation offers unique electronic properties.

Purpose of the Study:

• To synthesize and characterize a novel boron-nitrogen (BN) embedded dithienylthiazolothiazole unit (BNTz).
• To investigate the impact of the B ← N bond on molecular conformation and electronic properties.
• To evaluate the potential of BNTz as an n-type semiconductor material.

Main Methods:

• Chemical synthesis of the BNTz unit with a mesitylene group.
• Electrochemical and photophysical characterization.
• Theoretical analyses (e.g., DFT) to understand electronic structure and conformation.
• Fluorescence quenching studies with PBDB-T.

Main Results:

• The synthesized BNTz unit exhibits chemical stability and a rigid, coplanar conformation due to the B ← N bond.
• BNTz demonstrates high electron mobility (8.14 × 10⁻⁴ cm² V⁻¹ s⁻¹) and low LUMO energy (-3.73 eV).
• Strong visible light absorbance and effective exciton dissociation with PBDB-T were observed.

Conclusions:

• The BNTz unit possesses excellent electronic properties suitable for n-type semiconductor applications.
• The BN incorporation strategy effectively tunes molecular conformation and energy levels.
• BNTz shows promise for the development of next-generation organic electronic materials.