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Published on: November 7, 2016
Quinoidal Small Molecule Containing Ring-Extended Termini for Organic Field-Effect Transistors.
Yoonjung Mok1, Yunseul Kim1, Yina Moon1
1School of Materials Science and Engineering (SMSE), Research Institute for Solar and Sustainable Energies (RISE), Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea.
Synthesizing novel benzothiophene quinoidal thiophene (BzTQuT) molecules with extended termini effectively lowers the band gap. Blending BzTQuT with polymers improved organic field-effect transistor (OFET) performance, demonstrating a strategy for high-performance organic semiconductors.
Area of Science:
- Organic electronics
- Materials science
- Semiconductor physics
Background:
- Quinoidal small molecules are crucial for organic electronics.
- Modifying terminal units influences electronic properties.
- Fused ring extensions can tune π-electron delocalization.
Purpose of the Study:
- To synthesize and characterize benzothiophene quinoidal thiophene (BzTQuT) and quinoidal thiophene (QuT).
- To investigate the impact of fused ring extension in terminal units on molecular properties.
- To evaluate the charge transport characteristics in organic field-effect transistors (OFETs).
Main Methods:
- Synthesis and characterization of BzTQuT and QuT molecules.
- Analysis of π-electron delocalization and bond length alternation.
- Fabrication and testing of OFET devices using neat and blended films.
Main Results:
- Extended terminal units (BzTQuT) led to increased π-electron delocalization and reduced band gap.
- Neat BzTQuT films exhibited p-type transport with low hole mobility due to morphology.
- Blending BzTQuT with insulating polymers and annealing improved OFET mobility to 0.09 cm² V⁻¹ s⁻¹.
Conclusions:
- Extending terminal groups in quinoidal structures is an effective strategy for narrow band gap materials.
- Optimized film morphology is critical for achieving high charge transport in OFETs.
- These findings pave the way for designing advanced organic semiconductors.
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