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Growth of π-conjugated nanorods and application to organic fight emitting diodes

π共轭纳米棒的生长及其在有机发光二极管中的应用

基本信息

批准号：
16310098
负责人：
MURATA Hideyuki
金额：
$ 10.36万
依托单位：
Japan Advanced Institute of Science and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2007
项目状态：
已结题

项目摘要

Attaching functional organic layers to semiconductor surfaces may have applications in a number of areas, including molecular and biomolecular electronics, sensors and lithography. In this study, we have developed a novel, two-step strategy for the covalent bond formation between aromatic molecules and silicon surfaces. In the first step, a H-terminated Si (III)surface reacts with amino radicals to give a NH_2-terminated Si (III) surface at room temperature. The amino radicals were generated by the thermal decomposition of ammonia gas with Tungsten filament heated at 1000-1200℃. The formation of NH_2-terminated surface and the monolayer was confirmed by X-ray photoelectron spectroscopy (XPS) and Multi Internal Reflection Fourier Transfer Infrared Spectroscopy (MIR FT-IR). In the second step, the reaction of amino-terminated Si surface with an aromatic dialdehydes (1,4-bis (4-formylstyryl)benzene) (BFSB) was carried out by vacuum deposition of BFSB on the substrate heated at 130℃ under high vacuum. The reaction of amino-terminated surface between BFSB and the monolayer formation was confirmed by XPS and MIR FT-IR. Distinct images such as an island structure with the diameter of around 5 nm can be seen in non-contact atomic force microscopy (nc-AFM) images. The islands consist of several dots with the height of each dot was about 2.3 nm. According to the molecular orbital calculation (MOPAC), the length of BFSB molecule is about 2.2 nm. These results suggest that the each dot corresponds to the vertically aligned BFSB molecules. On the other hand, no photoluminescence from BFSB was observed on silicon surface, due to an energy transfer. Next, we have investigated the formation of organic monolayer on indium-tin-oxide (ITO) electrode and the effect to device performance of OLEDs. We have found that the carrier injection efficiency was enhanced by modification of ITO by organic monolayers depending on their chemical structure.

将功能有机层附着到半导体表面可以在许多领域中具有应用，包括分子和生物分子电子学、传感器和光刻。在这项研究中，我们已经开发了一种新的，两步策略的芳香族分子和硅表面之间的共价键的形成。第一步，在室温下，氢封端的Si（III）表面与氨基自由基反应，得到NH_2封端的Si（III）表面。氨基自由基是由氨气与钨丝在1000-1200℃下热分解产生的。用X射线光电子能谱（XPS）和多内反射傅里叶变换红外光谱（MIR FT-IR）证实了NH_2封端表面和单分子膜的形成。第二步，在130℃的高真空下，通过真空沉积的方法，在Si表面上形成了一种芳香二醛（1，4-双（4-甲酰基苯乙烯基）苯）（BFSB）。通过XPS和MIR FT-IR证实了BFSB表面的氨基化反应和单层膜的形成。在非接触原子力显微镜（nc-AFM）图像中可以看到清晰的图像，例如直径约为5 nm的岛状结构。这些岛由多个点组成，每个点的高度约为2.3nm。根据分子轨道计算（MOPAC），BFSB分子的长度约为2.2 nm。这些结果表明，每个点对应于垂直排列的BFSB分子。另一方面，由于能量转移，在硅表面上没有观察到来自BFSB的光致发光。接下来，我们研究了氧化铟锡（ITO）电极上有机单层膜的形成及其对器件性能的影响。我们已经发现，载流子注入效率提高了由有机单分子膜取决于它们的化学结构的ITO的改性。