Preferred orientation of 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene molecules on inorganic single-crystal substrates with various orientations
Preferred orientation of 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene molecules on inorganic single-crystal substrates with various orientations
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DOI：
10.7567/jjap.57.08re04
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发表时间：
2018-07
影响因子：
1.5
通讯作者：
A. Moh;K. Sasaki;T. Shinagawa;Seiji Watase;M. Izaki
中科院分区：
文献类型：
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作者：
A. Moh;K. Sasaki;T. Shinagawa;Seiji Watase;M. Izaki
采用真空热蒸发法在石英玻璃、A-、C-和R-单晶Al_2O_3(蓝宝石)、(100)-和(111)-单晶2，7-dioctyl[1]benzothieno[3，2-b][1]benzothiophene衬底上沉积了有机分子BTBT，并用X射线衍射仪和原子力显微镜对其结构进行了表征。无论衬底材料和取向如何，(0 0 1)晶面外取向与面内取向相似，其形成受π-π堆积诱导的分子有序化控制。取向程度通过与衬底材料相关的颗粒结构来反映。根据实验结果推测了取向C8-BTBT层的生长模型。
The organic molecule 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT) was deposited on quartz glass, A-, (0001) C-, and R-single-crystal Al2O3 (sapphire), and (100)-, and (111)-single-crystal MgO substrates by vacuum thermal evaporation, and structural characterizations were carried out by X-ray diffraction analysis and atomic force microscopy (AFM) observation. The (001) out-of-plane orientation with a similar in-plane orientation was obtained irrespective of the substrate material and orientation, and its formation was governed by π–π-stacking-induced molecular ordering. The degree of orientation was reflected by the grain structure related to the substrate material. The growth model of the oriented C8-BTBT layer was speculated on the basis of experimental results.