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Title
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Photo-induced shifts in the optical gap of a-Se thin films
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Author
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Abstract
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| Amorphous Se films were prepared by thermal evaporation. The photo-darkening induced by illumination with white light at various temperatures (80 K, 111 K, 146 K and 188 K, resp.) and with monochromatic light with wavelength lambda = 550 nm (80 K) was studied. Photoinduced bleaching of previously-darkened samples (X = 550 nm, 80 K) was observed at 80 K induced by illumination using light with lambda = 488 nm, 671 nm, 707 nm and 768 run, resp. It is suggested that the overall photo-darkening process is most probably a kind of self-limiting process. |
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Language
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English
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Source (journal)
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Journal of optoelectronics and advanced materials. - Bucharest
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Publication
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Bucharest
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2002
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ISSN
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1454-4164
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Volume/pages
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4
:3
(2002)
, p. 785-791
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ISI
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000177387200037
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Full text (publisher's version - intranet only)
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