Oligothiophene‐Functionalized Truxene: Star‐Shaped Compounds for Organic Field‐Effect Transistors
Oligothiophene‐Functionalized Truxene: Star‐Shaped Compounds for Organic Field‐Effect Transistors
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DOI：
10.1002/adfm.200400380
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发表时间：
2005-05
影响因子：
19
通讯作者：
Yanming Sun;Kai Xiao;Yunqi Liu;Jin-Liang Wang;J. Pei;G. Yu;Daoben Zhu
中科院分区：
文献类型：
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作者：
Yanming Sun;Kai Xiao;Yunqi Liu;Jin-Liang Wang;J. Pei;G. Yu;Daoben Zhu
有机场效应管(OFET)是一种新型的星形有机半导体材料，可用于溶液可加工的有机电子器件。用扫描电子显微镜、X射线衍射仪、紫外可见光谱和光致发光光谱研究了化合物1-3的电学和光学性质，发现化合物1-3的三个支链上的噻吩环数目增加。结果表明，随着各支链上噻吩环的逐渐增加，体系发生了由多晶态向非晶态的转变。用于OFET的化合物1、2和3的特性表现出显著的差异。化合物1的迁移率为1.03×10~(-3)cm~2·V~(-1)·S~(-1)，通断比约为103，这是迄今为止用于OFET的星形有机半导体材料的最高值。所有结果表明，低硫杂环戊二烯类化合物的基团不仅扩展了π离域体系，而且使化合物具有较高的迁移率。
Organic field‐effect transistors (OFETs) based on oligothiophene‐functionalized truxene derivatives have been fabricated for use as novel star‐shaped organic semiconductors in solution‐processible organic electronics. The electronic and optical properties of compounds 1–3, with increasing numbers of thiophene rings at each of the three branches, have been investigated using scanning electron microscopy (SEM), X‐ray diffraction measurements, and ultraviolet–visible (UV‐vis) and photoluminescence spectroscopies. The results show that with a stepwise increase of the thiophene rings at every branch, a transition from a polycrystalline to an amorphous state is observed. The characteristics of compounds 1, 2, and 3 used for OFETs exhibit a significant difference. The mobility depends greatly on the morphology in the solid state, and decreases in going from 1 to 3. Mobilities up to 1.03 × 10–3 cm2 V–1 s–1 and an on/off ratio of about 103 for compound 1 have been achieved; these are the highest values for star‐shaped organic semiconductors used for OFETs so far. All the results demonstrate that the truxene core of the oligothiophene‐functionalized truxene derivatives not only extends the π‐delocalized system, but also leads to high mobilities for the compounds.