Photo-induced softening and hardening in Ge–As–S amorphous films

Hardness, X-ray diffraction and transmission as well as infrared reflection measurements on virgin and ultraviolet (UV)-irradiated amorphous films of the Ge x As 40− x S 60 system have been performed. The UV light induces film softening for x<19 and film hardening for x>19. The structure remai...

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Bibliographic Details
Published inJournal of non-crystalline solids Vol. 227; pp. 719 - 722
Main Authors Popescu, M, Sava, F, Lõrinczi, A, Skordeva, E, Koch, P.-J, Bradaczek, H
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.01.1998
Subjects
Ge–As–S amorphous films
Photo-induced hardening
Photo-induced softening
Photo-induced hardening
C145
S430
Photo-induced softening
P210
Ge–As–S amorphous films
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Summary:Hardness, X-ray diffraction and transmission as well as infrared reflection measurements on virgin and ultraviolet (UV)-irradiated amorphous films of the Ge x As 40− x S 60 system have been performed. The UV light induces film softening for x<19 and film hardening for x>19. The structure remains amorphous but the distance characteristic of medium range order decreases for x<19 and increases for x>19. Photo-contraction of the films (up to ∼12%) has been revealed from IR spectra and X-ray transmission experiments. A main effect of UV light is the release of sulphur.
ISSN:0022-3093
1873-4812
DOI:10.1016/S0022-3093(98)00236-1