Molecular beam Epitaxy of conjugated polymers and their application to electronics

1994年是该研究项目的最后一年。重点介绍了分子束外延生长工艺的优化和光学性能的表征，并总结了相关的研究成果。(1)酞菁铜（CuPc）的优化MBE生长在装载到泻流室之前，将β型CuPc粉末加热以去除醇。泻流单元由铜制成，其具有良好的导热性并且配备有具有小孔（直径为1mm）的盖。将泻流室中的CuPc的温度设定为280 ℃。在预热衬底之后，打开泻流室的碎片以进行生长。使用云母、玻璃（Corning 7059）和Si（111）作为衬底。(2)在云母和玻璃衬底上生长的酞菁铜X射线衍射分析表明，酞菁铜分子在玻璃和云母衬底上的平面分别垂直和平行于衬底表面。样品的光吸收光谱与未掺杂样品的光吸收光谱有一定的区域性， ...更多信息 CuPc粉末，表明从HOMO到LUMO带的载流子产生。在Si（111）上的CuPc在装入MBE室之前，Si（111）表面的悬挂键通过HF处理被氢原子终止。有趣的是，生长的CuPc在暴露于紫外光时显示出明亮的蓝光发射。蓝光强度随光照时间的延长而降低。这表明激光诱导的结构变化。上述实验结果表明，我们已经建立了分子束外延生长酞菁铜晶体的技术，这是本研究项目的主要目标之一。特别是，已建立的MBE生长的CuPc在Si上的技术具有很大的潜力，用于开发由无机和有机半导体的组合组成的新的功能器件。少

A year of 1994 is the last year of the research project. We focused on optimization of the MBE growth and optical characterizations and summarized research accomplishments.(1) Optimized MBE growth of copper phthalocyanine (CuPc)Prior to loading into the effusion cell beta-type CuPc powder was heated to remove alcohol. The effusion cell was made of copper, which has a good thermal conductivity and was equipped with a cover with a small hole (a diameter of 1 mm). The temperature of the CuPc in the effusion cell was set to 280ﾟC.Following preheating of the substrates, the shatter of the effusion cell was opened for the growth. Mica, glass (Corning 7059) and Si (111) were used as substrates.(2) CuPc grown on mica and glass substratesFrom the x-ray diffraction analysis, it was found that the planes of CuPc molecules on glass and mica substrates were perpendicular and parallel to the substrate surface, respectively. The optical absorption spectra of the samples were district from that of the … More CuPc powder, suggesting the carrier generation from HOMO to LUMO bands. It is concluded that the CuPc films on mica and glass substrates are crystalline, not molecules.CuPc on Si (111)Prior to loading into the MBE chamber, the dangling bonds of Si (111) surface were terminated with hydrogen atoms by the HF treatment. The grown CuPc interestingly showed bright blue light emission when it was exposed to the ultraviolet light. The intensity of blue light decreased with the illumination time. This suggests a laser-induced structural change. There had not been any reports on blue light emission from the CuPc powder or films.The above experimental results clearly demonstrate that we have established a technique for the MBE growth of CuPc crytals, which is a main objective of the research project. In particular, the established technique for the MBE growth of CuPc on Si has a great potential for development of new functional devices consisting of a combination of inorganic and organic semiconductors. Less