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Influence of surface treatment on the photoelectrochemical behaviour of Y‐Ba‐Cu‐O thin films
Author(s) -
Hampel M.,
Grabner E. W.,
Jabs T.,
Strehblow H.H.
Publication year - 1991
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19910420706
Subject(s) - lithium perchlorate , x ray photoelectron spectroscopy , photocurrent , photoelectrochemistry , materials science , thin film , electrolyte , electrochemistry , inorganic chemistry , copper , oxide , lithium (medication) , surface layer , polarization (electrochemistry) , layer (electronics) , chemistry , analytical chemistry (journal) , chemical engineering , electrode , nanotechnology , metallurgy , optoelectronics , medicine , chromatography , endocrinology , engineering
Y‐Ba‐Cu‐O films with different surface treatments have been studied by photoelectrochemical and XPS measurements. The influence of etching by bromine in ethanol of these films has been followed by means of the electrochemical oxidation of ferrocene in an aprotic electrolyte. From the dependence of dark and photocurrent on etching time it is concluded that Y‐Ba‐Cu‐O thin films on LaAlO 3 are covered by a 1, 1nm thick nonstoichiometric surface layer. The cathodic polarization of Y‐Ba‐Cu‐O at ‐0,9 V vs. Ag/AgCl in acetonitrile/0,1 M lithium perchlorate leads to the formation of a lithium‐containing, oxygen‐enriched surface layer. The photoelectrochemical response of the reduced films is similar to that of cuprous oxide and passive layers on copper.