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首页> 外文期刊>Journal of Applied Physics >Anisotropy in structural and physical properties in tetrathiafulvalene derivatives-based zone-cast layers as seen by Raman spectroscopy, UV-visible spectroscopy, and field effect measurements
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Anisotropy in structural and physical properties in tetrathiafulvalene derivatives-based zone-cast layers as seen by Raman spectroscopy, UV-visible spectroscopy, and field effect measurements

机译：从拉曼光谱，紫外可见光谱和场效应测量结果看，基于四硫富瓦烯衍生物的区域浇铸层的结构和物理性能各向异性

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摘要

We have studied anisotropy of thin layers of amphiphilic tetrathiafulvalene derivatives (TTF-4SCn, with n=12, 18, and 22) obtained by zone-casting technique. All the films show optical anisotropy, as seen by polarized optical microscopy and polarized UV-visible spectroscopy. By using polarized Raman spectroscopy an angular dependence of intensity of different vibrational modes in respect to the zone-casting direction was determined. It was found that intensities of the modes related to central and ring C=C vibrations in the TTF core depend very strongly on the angle between the zone-cast direction and polarization plane of incident laser light. Comparison of the deduced orientation of the molecules in one of the films (TTF-4SC18) with its crystal structure shows that the polarized Raman spectroscopy can be useful for controlling orientation of molecules in thin films (e.g., for online monitoring). Organic field effect transistors (OFETs), with channels oriented in parallel and perpendicularly to the zone-casting direction, were built using the oriented TTF-4SCn films. In all cases a strong anisotropy of the charge carrier mobility (μ) was found; the best results were obtained for OFETs with TTF-4SC18, for which μ_‖=0.25 cm~2/V s, ON/OFF>10~5, and μ_‖/μ⊥≈170.
机译：我们研究了通过区域铸造技术获得的两亲四硫富富瓦烯衍生物（TTF-4SCn，n = 12、18和22）的薄层的各向异性。如通过偏振光学显微镜和偏振UV-可见光谱所看到的，所有膜均显示出光学各向异性。通过使用偏振拉曼光谱，确定了不同振动模式的强度相对于区域铸造方向的角度依赖性。已经发现，与TTF芯中的中心和环形C ＝ C振动有关的模的强度非常强烈地取决于区域投射方向与入射激光的偏振面之间的角度。将其中一部膜（TTF-4SC18）的分子推导方向与其晶体结构进行比较，表明偏振拉曼光谱可用于控制薄膜中分子的方向（例如，用于在线监测）。使用定向的TTF-4SCn薄膜构建了有机场效应晶体管（OFET），其沟道平行于并垂直于区域浇铸方向。在所有情况下，均发现了载流子迁移率（μ）的强各向异性；对于TTF-4SC18的OFETs，μ__ = 0.25 cm〜2 / V s，ON / OFF> 10〜5，μ_‖/μ⊥≈170，可获得最佳结果。

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  • 来源
    《Journal of Applied Physics》 |2010年第1期|P.014504.1-014504.7|共7页
  • 作者

    Sylwia Kotarba; Jaroslaw Jung; Aneta Kowalska; Tomasz Marszalek; Marcin Kozanecki; Pawel Miskiewicz; Marta Mas-Torrent; Concepci6 Rovira; Jaume Veciana; Josep Puigmarti-Luis; Jacek Ulanski;

  • 作者单位

    Department of Molecular Physics, Technical University of Lodz, 90-924 Lodz, Poland;

    Department of Molecular Physics, Technical University of Lodz, 90-924 Lodz, Poland;

    Department of Molecular Physics, Technical University of Lodz, 90-924 Lodz, Poland;

    Department of Molecular Physics, Technical University of Lodz, 90-924 Lodz, Poland;

    Department of Molecular Physics, Technical University of Lodz, 90-924 Lodz, Poland;

    Department of Molecular Physics, Technical University of Lodz, 90-924 Lodz, Poland;

    Institut de Ciencia de Materials de Barcelona (CSIC), Campus Universitari de Bellaterra, 08193 Cerdanyola del Valles, Spain;

    Institut de Ciencia de Materials de Barcelona (CSIC), Campus Universitari de Bellaterra, 08193 Cerdanyola del Valles, Spain;

    Institut de Ciencia de Materials de Barcelona (CSIC), Campus Universitari de Bellaterra, 08193 Cerdanyola del Valles, Spain;

    Institut de Ciencia de Materials de Barcelona (CSIC), Campus Universitari de Bellaterra, 08193 Cerdanyola del Valles, Spain;

    Department of Molecular Physics, Technical University of Lodz, 90-924 Lodz, Poland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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