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The Relation Between Molecular Packing or Morphology and Chemical Structure or Processing Conditions: the Effect on Electronic Properties

机译：分子堆积或形态与化学结构或加工条件之间的关系：对电子性质的影响

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摘要

In the past few decades, mainly two kind of organic semiconductors, namely small molecules and polymers, have been dealt with. It turns out that the difference between these two categories in terms of charge carrier transport arises from the potentially different morphologies and the molecular packing. There are many studies showing the effect of the chemical structure on the electronic properties. However, in this study, the focus is on the role of processing conditions which is found to be of at least equal importance. To study a range of morphologies and packing in as similar molecules, two systems prepared by "Click"-type chemistry are chosen, with the major difference between them being the replacement of a flat unit with one that introduces a slight twist to the aromatic skeleton. Through AFM and X-ray studies, it is shown that the molecule with the potentially flat geometry can exhibit a high degree of π-π stacking, leading to morphologies ranging from polycrystal-line to single crystals while the other is always in the amorphous film state. The transport properties are compared using organic field effect transistor (OFETs) in both top and bottom contact configurations.
机译：在过去的几十年中，主要处理两种有机半导体，即小分子和聚合物。事实证明，就电荷载流子传输而言，这两类之间的差异是由潜在的形态和分子堆积引起的。有许多研究表明化学结构对电子性能的影响。但是，在这项研究中，重点是处理条件的作用，发现处理条件至少具有同等的重要性。为了研究一系列形态和类似分子中的堆积，选择了两种通过“点击”型化学方法制备的系统，它们之间的主要区别是用一个对芳香族骨架略有扭曲的扁平单元代替了一个扁平单元。通过AFM和X射线研究表明，具有潜在平坦几何形状的分子可以表现出高度的π-π堆积，从而导致形态从多晶线到单晶不等，而另一个始终在非晶膜中州。使用有机场效应晶体管（OFET）比较顶部和底部接触配置中的传输特性。

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  • 来源
    《Advanced Functional Materials》 |2014年第17期|2530-2536|共7页
  • 作者

    Pramod Kumar; Kammasandra Nanajunda Shivananda; Wojciech Zajqczkowski; Wojciech Pisula; Yoav Eichen; Nir Tessier;

  • 作者单位

    Nanoelectronics Center, Department of Electrical Engineering Technion - Israel Institute ofTechnology Technion City, 32000, Haifa, Israel;

    Schulich Faculty of Chemistry, Technion - Israel Institute of Technology Technion City, 32000, Haifa, Israel;

    Max Planck Institute for Polymer Research Ackermannweg 10, 55128, Mainz, Germany;

    Max Planck Institute for Polymer Research Ackermannweg 10, 55128, Mainz, Germany;

    Schulich Faculty of Chemistry, Technion - Israel Institute of Technology Technion City, 32000, Haifa, Israel;

    Nanoelectronics Center, Department of Electrical Engineering Technion - Israel Institute ofTechnology Technion City, 32000, Haifa, Israel;

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