Abstract
The evolution of the plastic properties of chalcogenide glassy semiconductor films continuously irradiated by light in the spectral region of intrinsic absorption has been studied. The photoinduced variation of plasticity (photoplastic effect) exhibits a two-stage character, whereby an intermediate metastable phase is formed in the first stage. The plasticity of this phase is higher than that of the light-stable phase formed upon prolonged irradiation. In both stages, the photoplastic effect was quantitatively characterized by viscosity measured using a microindentation technique. The most pronounced photoplastic effect is observed in freshly deposited As50Se50 films, the viscosity of which changes from ∼1.5×1012 P in the initial stage (giant photosoftening) to ∼6×1014 P in the final stage.
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