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Alkylsubstituted thienothiophene semiconducting materials: structure-property relationships
Mingqian He1, Jianfeng Li, Michael L Sorensen
1Corning Incorporated, SP-FR-6, Corning, New York 14830, USA. hem@corning.com
Researchers synthesized conjugated polymers with fused thiophene rings to study structure-property relationships. Even-numbered ring polymers exhibited enhanced crystalline structure and charge carrier mobility, demonstrating improved electronic properties through molecular design.
Area of Science:
- Materials Science
- Polymer Chemistry
- Organic Electronics
Background:
- Conjugated polymers are crucial for organic electronics.
- Understanding structure-property relationships is key to optimizing polymer performance.
- Fused thiophene structures offer unique electronic and structural characteristics.
Purpose of the Study:
- To synthesize and characterize a series of conjugated polymers with varying numbers of fused thiophene rings.
- To investigate the impact of fused ring structure on polymer properties, including electronic stability and morphology.
- To establish structure-property correlations for enhanced polymer electronic device performance.
Main Methods:
- Synthesis of conjugated polymers with 3-5 fused thiophene rings and identical alkyl side chains.
- Ionization potential (IP) measurement to assess oxidative stability.
- X-ray diffraction (XRD) and Atomic Force Microscopy (AFM) for structural and morphological analysis.
- Field-effect transistor (FET) characterization to evaluate charge carrier mobility.
Main Results:
- All synthesized polymers exhibited well-extended conjugation along the backbone.
- Ionization potentials (5.15–5.21 eV) indicated excellent oxidative stability.
- Polymers with an even number of fused thiophene rings formed tighter crystalline structures with tilted side chains, leading to a 10-fold increase in charge carrier mobility compared to odd-numbered counterparts.
- Odd-numbered ring polymers displayed looser packing.
Conclusions:
- The number of fused thiophene rings significantly influences polymer crystalline structure and charge transport.
- Even-numbered fused ring systems promote enhanced molecular packing and higher charge carrier mobility.
- Strategic molecular design and side-chain arrangement are critical for optimizing the electronic properties of conjugated polymers.
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