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Spontaneous Orientation of Alq3 Molecule in Evaporated Film and Its Vanishment by Light Irradiation

Published online by Cambridge University Press:  15 February 2011

Keiji Sugi
Affiliation:
Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, JAPAN Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Corporation (JST), 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, JAPAN
Hisao Ishii
Affiliation:
Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, JAPAN Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Corporation (JST), 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, JAPAN
Yasuo Kimura
Affiliation:
Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, JAPAN Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Corporation (JST), 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, JAPAN
Michio Niwano
Affiliation:
Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, JAPAN Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Corporation (JST), 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, JAPAN
Naoki Hayashi
Affiliation:
Department of Chemistry, Graduate School of Science, Nagoya University, Nagoya 464-8602,JAPAN
Yukio Ouchi
Affiliation:
Department of Chemistry, Graduate School of Science, Nagoya University, Nagoya 464-8602,JAPAN
Eisuke Ito
Affiliation:
RIKEN, Frontier Research System, Wako 351-0198, JAPAN
Kazuhiko Seki
Affiliation:
Research Center for Materials Science, Nagoya University, Nagoya 464-8602, JAPAN
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Abstract

Recently we found high and persistent spontaneous buildup of the surface potential upon vacuum vapor deposition of tris(8-hydroxyquinolinato) aluminum(III)(Alq3) on Au substrate under dark conditions (28 V for 560 nm thick Alq3 film). Such giant potential is removed by visible-light irradiation. These natures of the film suggest the possible applications to various organic devices such as memory devices. 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 Alq3 molecules.

Type
Research Article
Copyright
Copyright © Materials Research Society 2003

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References

1. Ito, E., Wachizu, Y., Hayashi, N., Ishii, H., Matsuie, N., Tsuboi, K., Ouchi, Y., Harima, Y., Yamashita, K., and Seki, K., J. Appl. Phys. 92, 7306 (2002)CrossRefGoogle Scholar
2. Sugi, K., Kimura, Y., Ishii, H., Niwano, M., to be published.Google Scholar
3. Sampor, W., Kalinowski, J., Marconi, G., Di Marco, P., Fattori, V., and Giro, G., Chem. Phys. Lett. 283, 373 (1998)CrossRefGoogle Scholar

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