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首页> 外文学位 >Interfaces in organic electronic devices: Surface characterization and modification and their effect on microstructure in molecular assemblies.
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Interfaces in organic electronic devices: Surface characterization and modification and their effect on microstructure in molecular assemblies.

机译：有机电子设备中的界面：表面表征和修饰及其对分子组件中微结构的影响。

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摘要

This dissertation has focused on (i) the characterization and optimization of the near-surface region of indium-tin oxide (ITO) thin films, and (ii) the characterization of the microstructure and electrical properties of thin films of several new self-organizing liquid crystalline phthalocyanines (Pcs).; Commercial ITO surfaces were explored through a combination of high resolution X-ray photoelectron spectroscopy and electrochemical techniques. It was determined that sputter-deposited ITO films undergo hydrolysis immediately upon exposure to atmosphere, creating InOOH and In(OH)3 species, which appear to inhibit charge transfer reactions. The surface coverage of these InOOH and In(OH)3-like species can be controlled by various solution and vacuum pretreatments, including etching with EDTA solutions, and RF-plasmas.; Characterization of new discotic mesophase Pc materials has focused on modifications of the original Pc in this series, CuPc(OCH2CH 2OBz)8, including a polymerizable version, CuPc(OCH 2CH2OCH2CH=CH-Ph)8, and the sulfur analogs of these molecules, CuPc(SCH2CH2OBz)8 and CuPc(SCH2CH 2OCH2CH=CH-Ph)8. The self-organizing properties of these new Pcs are altered by the changes in side chain composition, but still show the same “column-forming” tendencies as the parent Pc, with long range order. The polymerizable Pc materials can be photolithographically patterned with features as small as 2 microns. Electrical anisotropies in these films were measured with a conductive tip AFM and with OFETs, and anisotropies in current (j||/j⊥) were ca. 10 on the micron scale, and up to 1000 on the submicron scale. OFET measurements showed low hole mobilities, which are attributed to poor contact between the Pc column and the Au electrodes. Chemical modification of these electrodes shows that considerable improvements in OFET performance result from this modification strategy.; Understanding and controlling the microscopic structure of these Pc films is important for optimizing their electrical properties. A considerable effort was focused on developing a quantitative protocol to combine transmission and reflectance vibrational spectroscopic data to determine the three Euler angles that determine the orientation of these Pcs in an LB-deposited film on a planar substrate. Changes in orientation upon annealing and polymerization were observed, but in general these molecules display tilt angles away from the surface normal of 20° and twists about the surface normal of ca. 25°.
机译：本论文着重于（i）氧化铟锡（ITO）薄膜近表面区域的表征和优化，以及（ii）几种新的自组织薄膜的微观结构和电性能的表征液晶酞菁（Pcs）。通过将高分辨率X射线光电子能谱和电化学技术相结合，探索了商用ITO表面。可以确定，溅射沉积的ITO薄膜在暴露于大气后会立即发生水解，产生InOOH和In（OH） 3 物质，这似乎抑制了电荷转移反应。这些InOOH和In（OH） 3 类物质的表面覆盖可以通过各种溶液和真空预处理来控制，包括用EDTA溶液蚀刻和RF-等离子。新的盘状中间相Pc材料的表征集中于对该系列原始Pc CuPc（OCH 2 CH 2 OBz） 8 的修饰，包括可聚合版本CuPc（OCH 2 CH 2 OCH 2 CH = CH-Ph） 8 这些分子的硫类似物CuPc（SCH2CH2OBz）8和CuPc（SCH 2 CH 2 OCH 2 CH = CH-Ph） 8 。这些新的PC的自组织特性会因侧链组成的变化而改变，但仍显示出与父级PC相同的“列形成”趋势，且具有长程顺序。可聚合的Pc材料可以用小至2微米的特征进行光刻图案化。用导电尖端AFM和OFET测量这些膜中的电各向异性，并且电流（j || / j ＆subbottom ）的各向异性约为。微米级为10，亚微米级为1000。 OFET测量显示空穴迁移率低，这归因于Pc柱与Au电极之间的接触不良。这些电极的化学改性表明，这种改性策略可显着改善OFET性能。了解和控制这些Pc薄膜的微观结构对于优化其电性能很重要。大量的精力集中在开发定量协议上，以结合透射和反射振动光谱数据来确定三个欧拉角，这些欧拉角确定了这些Pcs在平面衬底上的LB沉积膜中的取向。观察到在退火和聚合时取向的变化，但是通常这些分子显示出偏离<20°的表面法线的倾斜角，并且绕ca的表面法线扭曲。 25°。

著录项

  • 作者

    Donley, Carrie Lynn.;

  • 作者单位

    The University of Arizona.;

  • 授予单位 The University of Arizona.;
  • 学科 Chemistry Analytical.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 311 p.
  • 总页数 311
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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