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Spectroscopic Photoresponse of the Passive Film Formed on Iron

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J.Electrochem.Soc.133,1326-1329(1986), Spectroscopic photo respnse --iron.pdf357.13 kBPDFView/Open
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Title: Spectroscopic Photoresponse of the Passive Film Formed on Iron
Authors: Azumi, Kazuhisa Browse this author
Ohtsuka, Toshiaki Browse this author →KAKEN DB
Sato, Norio Browse this author
Keywords: iron
band structure
Issue Date: Jul-1986
Publisher: The Electrochemical Society
Journal Title: J. Electrochemical Society
Volume: 133
Issue: 7
Start Page: 1326
End Page: 1328
Publisher DOI: 10.1149/1.2108863
Abstract: Spectroscopic photoresponse of the passive film formed on iron in neutral borate solution was studied. The spectroscopic three parameter reflectometry and the photoelectrochemical technique were employed to obtain the spectra of absorption coefficient and photocurrent. From these spectra, a conversion efficiency, η, from the flux of photons absorbed in the film to the photocurrent was calculated as a function of photon energy. The result shows that the photoexcitation process of electron-hole-pair formation includes two transition mechanisms; a direct allowed transition and an indirect allowed transition. The direct transition, which occurs in the photon energy higher than 2.6 eV, is attributed to the excitation between the valence (O-2p) and the conduction (Fe-3d) bands of iron oxide, whereas the indirect transition, which occurs in the photon energy higher than 0.8 eV, is associated with electronic levels of impurities or d-d transition in the passive film. The maximum value of V observed at a photon energy of 3.1 eV is about 20%, and this high efficiency suggests that the high electric field exists in the passive film of iron.
Rights: © The Electrochemical Society, Inc. 1986. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in J. Electrochem. Soc. 1986 volume 133, issue 7, 1326-1328 .
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大塚 俊明

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