期刊
NATURE MATERIALS
卷 8, 期 5, 页码 421-426出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT2427
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资金
- EU project NAIMO [NMP-CT-2004-500355]
- Max Planck Society
- German Science Foundation (Korean-German IRTG)
- DFG Priority Program [SPP 1355, AN 680/1-1]
- Alexander von Humboldt Foundation
- EPSRC
- Carlsberg Foundation
- EPSRC [EP/E044832/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/E044832/1] Funding Source: researchfish
Discotic liquid crystals are a promising class of materials for molecular electronics thanks to their self-organization and charge transporting properties. The best discotics so far are built around the coronene unit and possess six-fold symmetry. In the discotic phase six-fold-symmetric molecules stack with an average twist of 30 degrees, whereas the angle that would lead to the greatest electronic coupling is 60 degrees. Here, a molecule with three-fold symmetry and alternating hydrophilic/hydrophobic side chains is synthesized and X-ray scattering is used to prove the formation of the desired helical microstructure. Time-resolved microwave-conductivity measurements show that the material has indeed a very high mobility, 0 : 2 cm(2) V(-1)s(-1). The assemblies of molecules are simulated using molecular dynamics, confirming the model deduced from X-ray scattering. The simulated structures, together with quantum-chemical techniques, prove that mobility is still limited by structural defects and that a defect-free assembly could lead to mobilities in excess of 10 cm(2) V(-1)s(-1).
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