Research of control on organic interface and their application to high speed organic optical and electrical devices

有机材料具有低温加工的优点，可以在包括聚合物材料在内的各种材料上制造器件。它们也可以通过溶液工艺制成薄膜器件。为了实现电和光器件，器件应该在高速下工作，然而，它们通常在低速下工作。本课题组实现了有机发光二极管100 Mb以上的高速工作。本研究项目的目的是通过控制有机-有机和有机-电极界面实现有机器件的高速运转，经过3年的研究，建立了有机光电探测器的高速运转、有机发光二极管的高效电流注入等。有机发光二极管、有机薄膜晶体管、有机光检测器等有机器件的高性能化已在溶液法中得到实现。对于柔性器件，高效率的有机发光二极管是通过溶液法在聚合物基板上实现的，透明电极是利用聚合物材料制造的。对于薄膜晶体管，薄膜有机导电材料是根据栅绝缘材料进行研究的，并最终通过控制栅绝缘材料中OH基团的浓度来实现高性能的器件。对于有机光电探测器，通过选择有机材料的组合，实现了高速光电探测器，通过选择酞菁和苝衍生物，探测速度达到了100 MHz。通过对有机材料和界面的研究，实现了高速有机光电器件的研制。

Organic materials have advantages to be processed in low temperature and can be fabricated devices on various kinds of materials including polymeric materials. They can also be fabricated thin film devices by solution process. In order to realize electrical and optical devices, the devices should be operated under high speed, however, they are used to be operated under slow speed. The research group of this project realized high speed operation of organic light emitting diodes over 100 Mbs. The aim of this research project is to realize high speed operation of organic devices by controlling organic-organic and organic-electrode interfaces.After the 3 year period of the research project, the members established high speed operation of organic photo detectors, efficient current injection of organic light emitting diodes. High performance has been realized in organic devices fabricated by solution process including organic light emitting diodes, organic thin film transistors, and organic photo detectors.As for flexible devices, highly efficient organic light emitting diodes are realized by solution process on polymeric substrates, and the transparent electrodes are fabricated utilizing polymeric materials.For the thin film transistors, thin film organic conductive materials has been investigated according to the gate insulating materials, and finally the high performance device is realized by controlling the concentration of OH group of the gate insulating materials.As for organic photo detectors, high speed photo detectors have been realized by selecting the combination of organic materials, and detection speed have been reached at 100 MHz by choosing phthalocyanine and perylene derivatives. The photo detectors have been also fabricated by solution process and the detection speed was over 10 MHz.By investigation of the organic materials and interfaces, high speed organic devices have been realized for optical and electrical devices.