Photochemical Decomposition of Co Phthalocyanine Films Using Ultraviolet Excimer Lamp

Structural and compositional changes of Co phthalocyanine (CoPc) films irradiated by ultraviolet (UV) light of 7.21 eV using an excimer lamp and the corresponding photo-oxidation process have been investigated. Optical absorption and X-ray photoelectron spectroscopy (XPS) measurements showed that th...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2000-07, Vol.39 (7R), p.4195
Main Authors: Naoki Ohta, Naoki Ohta, Manabu Gomi, Manabu Gomi
Format: Article
Language:English
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Summary:Structural and compositional changes of Co phthalocyanine (CoPc) films irradiated by ultraviolet (UV) light of 7.21 eV using an excimer lamp and the corresponding photo-oxidation process have been investigated. Optical absorption and X-ray photoelectron spectroscopy (XPS) measurements showed that the CoPc molecules in the films are completely decomposed by the light irradiation and resultant photo-oxidation, so that only Co oxides remain on the substrate surface. The C–N bonds which form the main frame of the Pc molecule were found to be broken with a high probability at an earlier stage of the dissociation process, as compared to the C=C bonds. The organic species with the bonds cleaved by photo-oxidation were finally removed from the substrate surface.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.39.4195