Abstract
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.
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