| Abstract
| - The efficient synthesis of decyl-end-capped thiophene−phenylene oligomers with different numbersand positions of 1,4-phenyl rings within a 2,5-oligothiophene conjugated chain, leading to electronic-grade pure semiconducting organic materials with improved oxidation stability, was elaborated. Theseare p-type organic semiconductors, showing high charge-carrier mobilities up to 0.4 cm2/Vs and on/offcurrent ratios as large as 105 in organic thin-film transistors, as well as stage delays as low as 300 μs inthe integrated circuits (ring oscillators). Long decyl end chains in these oligomers having 5−7 conjugatedaromatic rings lead to limited solubility but improve the oligomers' crystallinity, making them promisingsemiconducting materials for organic electronic devices prepared by vapor evaporation. Investigation ofthe optical properties of the oligomers showed that they have a HOMO−LUMO energy gap approximately0.2 eV higher than that of the corresponding oligothiophenes. Electrochemical measurements revealed abetter oxidation stability of the thiophene−phenylene oligomers as compared to that of their oligothiopheneanalogues.
- Decyl-end-capped thiophene−phenylene oligomers having 5−7 conjugated aromatic rings are organic semiconducting materials with improved oxidation stability compared to that of their oligothiophene analogues. Long decyl end chains lead to limited solubility, but improved crystallinity makes them promising semiconducting materials for organic electronic devices prepared by vapor evaporation.
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