Assembly, structure, and performance of an ultra‐thin film organic field‐effect transistor (OFET) based on substituted oligothiophenes
Assembly, structure, and performance of an ultra‐thin film organic field‐effect transistor (OFET) based on substituted oligothiophenes
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基于取代低聚噻吩的超薄膜有机场效应晶体管（OFET）的组装、结构和性能
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发表时间：
2008
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通讯作者：
S. Scheinert
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作者：
K. Haubner;E. Jaehne;H. Adler;D. Koehler;C. Loppacher;L. Eng;J. Grenzer;A. Herasimovich;S. Scheinert
我们报告了小分子有机场效应晶体管（OFET）的改进组装和表征。合成了新型α，ω-二氰基取代的β，β′-二丁基四噻吩（DCNDBQT），并通过紫外-可见光谱、差示扫描量热、热重分析和循环伏安等方法对其进行了表征。通过专门设计的双功能自组装分子（SAM）5-氰基-2-（丁基-4-膦酸）-3-丁基噻吩（CNBTPA），有效地促进了TiO 2模板上超薄有机膜的形成。通过UHV非接触原子力显微镜（nc-AFM）和X射线衍射研究发现，通过UHV真空升华制备的多达9个DCNDBQT分子厚的膜具有优异的结构特性。X射线和nc-AFM数据都表明，DCNDBQT分子形成了一个良好有序的阶梯结构，其台阶高度为1.5 nm至2.0 nm。因此，DCNDBQT分子通过与TiO 2模板准垂直的氢键相互作用（参见结构模型）连接到功能性SAM界面层，从而提供邻近噻吩环的最佳轨道重叠。
We report on the improved assembly and characterization of a small molecule organic field‐effect transistor (OFET). Novel α,ω‐dicyano substituted β,β′‐dibutylquaterthiophene molecules (DCNDBQT) were synthesized and characterized by UV–Vis spectroscopy, differential scanning calorimetry, thermal gravimetric analysis and cyclic voltammetry. The ultra‐thin organic film formation on TiO2 templates was effectively promoted through the specifically designed bifunctional self assembly molecules (SAM) 5‐cyano‐2‐(butyl‐4‐phosphonic acid)‐3‐butylthiophene (CNBTPA). Excellent structural properties were found for up to 9 DCNDBQT molecule thick films prepared through UHV vacuum sublimation as investigated with UHV non‐contact atomic force microscopy (nc‐AFM) and X‐ray diffraction. Both X‐ray and nc‐AFM data indicate that the DCNDBQT molecules form a well‐ordered terraced structure exhibiting step heights of 1.5 nm to 2.0 nm layers. Hence, the DCNDBQTmolecules are linked to the functional SAM interface layer by H‐bond interactions (see structure model) standing quasi perpendicular to the TiO2 template, and thus providing optimal orbital overlap neigh‐bouring thiophene rings.