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Photoinduced effects of GeSe 2 and Ge 2 Se 3 films illuminated in air and in vacuum are investigated by in situ transmission spectra measurements. Both compositions exhibit photobleaching (PB) when exposed to bandgap laser for a prolonged time in air. By comparing with the photoinduced effects in vacuum, we conclude that PB in Ge 2 Se 3 film results from surface photo-oxidation, whereas intrinsic structural changes dominate the PB in GeSe 2 film.
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Yan et al. (2011) studied this question.
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