Investigation of the effect of optical radiation on resistive switching of MIS-structures based on ZrO$_2$(Y) on Si(001) substrates with Ge nanoislands

The effect of optical radiation in the visible and near-infrared bands on resistive switching of a MOS stack based on ZrO$_2$(Y) film on an $n$-Si(001) substrate with self-assembled Ge nanoislands on its surface has been studied. An increase in the resistive switching logical gap was observed upon the photoexcitation, in particular, when the photon energies were smaller than the Si band gap. The effect was associated with the impact of the photo-emf at the Si/Ge/ZrO$_2$(Y) interface. In the latter case, the effect is associated with spatially indirect interband optical transitions in Ge nanoislands.