Abstract
The photoinduced variation of plasticity (photoplastic effect) in glassy semiconductor films was studied for the first time on a nanoscale level using a nanoindentation technique. It is shown that an increase in Young’s modulus and a decrease in the nanohardness for such films in the initial stage of their exposure to light with a wavelength in the vicinity of the fundamental absorption edge is a characteristic feature of the photomechanical response kinetics. The photoplastic after-effect has been observed, whereby the state of film softening (as compared to the initial dark state) is retained for some time after the light switch-off, and the length of this period is dependent on the conditions of exposure.
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