Characterization of light-erasable giant surface potential built up in evaporated Alq3 thin films
| Autor: | Yukio Ouchi, Yuki Kimura, Hisao Ishii, Kazuhiko Seki, Michio Niwano, Eisuke Ito, Y. Washizu, Keiji Sugi, Naoki Hayashi |
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| Rok vydání: | 2004 |
| Předmět: |
business.industry
Metals and Alloys chemistry.chemical_element Depolarization Surfaces and Interfaces Substrate (electronics) Surfaces Coatings and Films Electronic Optical and Magnetic Materials Characterization (materials science) law.invention Optics chemistry Vacuum deposition Aluminium law Materials Chemistry Optoelectronics Molecule Thin film business Light-emitting diode |
| Zdroj: | Thin Solid Films. :412-415 |
| ISSN: | 0040-6090 |
| Popis: | Recently high and persistent spontaneous buildup of a surface potential (SP) upon vacuum deposition of tris (8-hydroxyquinolinato) aluminum (III) (Alq 3 ), which is widely used for organic light emitting devices, on a gold substrate under dark condition (28 V for 560-nm-thick Alq 3 film) has been reported. The removal of the giant surface potential by visible light irradiation has also been reported. These properties of Alq 3 film suggest potential applications to various organic devices such as memory. In this study, we investigated the retention time of the giant potential and the mechanism of the light-induced depolarization in order to discuss the feasibility of the device applications. The observed decay rate of the surface potential in vacuum condition was roughly 10% loss in 10 years, which is enough for memory devices. As to the decay rate by light-irradiation, the observed rate was successfully reproduced by a theoretical simulation based on the photo-induced randomization of oriented Alq 3 molecules. |
| Databáze: | OpenAIRE |
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