Abstract
The photodarkening effect in amorphous As2S3 films is studied.The optical absorption edge shifts to a lower energy after illumination atthe bandgap light of 514.5 nm wavelength by an argon laser. The shift inwell-annealed films can be recovered by annealing at 180°C for 1 h but inun-annealed films it is irreversible. In addition, it was found that themagnitude of photodarkening ΔE increased with the increase ofillumination light intensity and illumination time. The reversibility ofphotodarkening in amorphous As2S3 films can be applied in opticalmemories.
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