Organic materials for electronic and optoelectronic devices

Organic materials for electronic and optoelectronic devices...

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Unformatted text preview: J O U R N A L O F C H E M I S T R Y Materials Organic materials for electronic and optoelectronic devices { Yasuhiko Shirota Department of Applied Chemistry, Faculty of Engineering, Osaka University, Yamadaoka, Suita, Osaka, 565-0871, Japan. E-mail: Received 11th October 1999, Accepted 2nd November 1999 This article concentrates on our recent results on several classes of photo- and electro-active organic materials that permit thin film formation and discusses their synthesis, properties, functions and potential applications for electronic and optoelectronic devices. The materials studied include amorphous molecular materials, titanyl phthalocyanine, oligothiophenes with well-defined structures, and non-conjugated polymers containing pendant oligothiophenes or other p-electron systems. The thin films of these materials find potential applications for use in organic electroluminescent, photovoltaic, electrochromic, and other devices. 1 Introduction Recent extensive studies have shown that organic materials exhibit a variety of interesting optical, electrical, photoelectric, and magnetic properties in the solid state. Photo- and electro- active organic materials have been the subject of recent attention, including organic semiconductors, organic metals including superconductors, organic photoconductors, organic photoactive materials for solar cells, organic non-linear optical materials, organic ferromagnets, photo- and electrochromic organic materials, resist materials, liquid crystals, and others. Among them, organic photoconductors, liquid crystals, and resist materials have been put to practical use for photo- receptors in electrophotography, display devices, and litho- graphic processes for the production of semiconductor devices. In addition, organic materials have found a number of potential applications for use in electronic and optoelectronic devices such as sensors, plastic batteries, solar cells, field-effect transistors, optical data storage, organic electroluminescent devices, switching devices, frequency doublers, and many others. In contrast to inorganic materials that consist of covalent or ionic bonds of atoms over the entire expanse of solids, organic materials are based on independent molecules and charac- terised by weak intermolecular interactions. Therefore, designs of organic materials can be readily performed on the molecular level. In particular, organic p-electron systems have received attention as potential photo- and electro-active materials. When these organic materials are used in electronic and optoelectronic devices, they are normally in the form of thin films. Organic thin films are prepared by various techniques, e.g. , solvent cast from solution, spin coating, vacuum vapor deposition, electrochemical deposition, LangmuirBlodgett and monolayer self-assembly techniques. Both ordered and disordered films can be generated, depending on the technique of thin film fabrication....
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Organic materials for electronic and optoelectronic devices...

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