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Published on: November 7, 2016
A cyclic triphenylamine dimer for organic field-effect transistors with high performance
Yabin Song1, Chong'an Di, Xiaodi Yang
1Key Laboratory of Organic Solids, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Science, Beijing 100080, PR China.
Journal of the American Chemical Society
|December 15, 2006
Summary
Cyclic triphenylamine dimers form highly crystalline films, unlike linear versions. This structural change significantly boosts performance in field-effect transistor (FET) semiconductors.
Area of Science:
- Organic electronics
- Materials science
- Semiconductor physics
Background:
- Triphenylamine derivatives are widely studied for organic electronics.
- Molecular structure significantly impacts thin-film morphology and electronic properties.
- Achieving high crystallinity in organic semiconductors is crucial for device performance.
Purpose of the Study:
- To investigate the effect of molecular geometry (cyclic vs. linear) on thin-film formation and field-effect transistor (FET) semiconductor performance.
- To compare the properties of a cyclic ethylene-linked triphenylamine dimer with its linear counterpart.
- To explore structure-property relationships in organic semiconductor materials.
Main Methods:
- Vapor deposition technique was used to form thin films of both cyclic and linear triphenylamine molecules.
- Thin-film morphology was characterized to assess crystallinity (crystalline vs. amorphous).
- Field-effect transistor (FET) devices were fabricated and characterized to evaluate semiconductor performance.
Main Results:
- The cyclic ethylene-linked triphenylamine dimer formed highly crystalline thin films.
- The corresponding linear molecule formed amorphous films under identical vapor deposition conditions.
- Field-effect transistor (FET) devices based on the cyclic molecule exhibited significantly improved performance.
- Mobilities exceeding 10-2 cm2 V-1 s-1 and high on/off ratios up to 107 were achieved with the cyclic molecule.
Conclusions:
- Molecular design, specifically the transition from linear to cyclic structures, is a critical factor in achieving high-quality crystalline thin films for organic electronics.
- The enhanced crystallinity of the cyclic triphenylamine dimer directly translates to superior field-effect transistor (FET) semiconductor performance.
- Cyclic molecular architectures offer a promising strategy for developing high-performance organic semiconductor materials.
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