| Project/Area Number |
18350024
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Organic chemistry
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| Research Institution | Hiroshima University |
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Principal Investigator |
TAKIMIYA Kazuo Hiroshima University, Graduate School of Engineering, Professor (40263735)
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| Co-Investigator(Kenkyū-buntansha) |
MIYAZAKI Eigo Hiroshima university, Graduate School of Engineering, Assistant Professor (00432683)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥15,870,000 (Direct Cost: ¥15,000,000、Indirect Cost: ¥870,000)
Fiscal Year 2007: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2006: ¥12,100,000 (Direct Cost: ¥12,100,000)
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| Keywords | Quinoid strcture / Single component organic conductor / Extended π-system / Organic FET / n-Channel semiconductor / Oligomer / Band gap / 電子受容体 |
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| Research Abstract |
In order to develop novel electronic materials based on extended thienoquinoide structure, following two molecular design approaches were tested:
1. Substitution of the bulky solublizing groups with smaller methyl groups for enhancing the intermolecular interaction/
2. Hybridization of highly soluble thiophene sits and unsubstituted thiophene or selenophene units in order to compromise high solubility and ability of intermolecular interaction.
With the first approach, dicyanomethylene-substituted oligomers up to the pentamer were successfully synthesized. Owing to the poor solubility with the elongation of the oligomer chain further longer homologues can not be Slated and purified. However, the conductivity at the solid state measured by two-probe technique using the compaction pellet samples was improved by two orders of magnitude than those with bulky ether substituents possessing the same oligothiophene chain length The second approach was also useful for develop new electronic materials. The longest oligomer obtained by the approach was the hexamer, and the conductivity of the series of compounds was also impinged by two orders of magnitude. In addition, we found that the trimers are very useful as highly soluble n-channel or ambipolar organic semiconductor that gives air stable, solution processible n-channel OFETs.
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