Self-Assembly, Molecular Ordering, and Charge Mobility in Solution-Processed Ultrathin Oligothiophene Films
| Autor: | Dean M. DeLongchamp, Jean M. J. Frechet, Sharadha Sambasivan, Amanda R. Murphy, Daniel A. Fischer, Priscilla Vandyke, Vivek Subramanian, Jinsong Liu, Eric K. Lin, Paul Chang |
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| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | Chemistry of Materials. 17:6033-6041 |
| ISSN: | 1520-5002 0897-4756 |
| Popis: | Symmetrical α,ω-substituted quarter-(T4), penta-(T5), sexi-(T6), and heptathiophene (T7) oligomers containing thermally removable aliphatic ester solubilizing groups were synthesized, and their UV−vis and thermal characteristics were compared. Spun-cast thin films of each oligomer were examined with atomic force microscopy and near-edge X-ray absorption fine structure spectroscopy to evaluate the ability of the material to self-assemble from a solution-based process while maintaining complete surface coverage. Films of the T5−T7 oligomers self-assemble into crystalline terraces after thermal annealing with higher temperatures required to affect this transformation as the size of the oligomers increases. A symmetrical α,ω-substituted sexithiophene (T6-acid) that reveals carboxylic acids after thermolysis was also prepared to evaluate the effect of the presence of hydrogen-bonding moieties. The charge transport properties for these materials evaluated in top-contact thin film transistor devices were found t... |
| Databáze: | OpenAIRE |
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