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Using the Landau-Ginzburg-Devonshire approach, we study light-induced phasetransitions, evolution of polar state and domain morphology inphoto-ferroelectric nanoparticles (NPs). Light exposure increases the freecarrier density near the NP surface and may in turn induce phase transitionsfrom the nonpolar paraelectric to the polar ferroelectric phase. Using theuniaxial photo-ferroelectric Sn2P2S6 as an example, we show that visible lightexposure induces the appearance and vanishing of striped, labyrinthine orcurled domains and changes in the polarization switching hysteresis loop shapefrom paraelectric curves to double, pinched and single loops, as well as theshifting in the position of the tricritical point. Furthermore, we demonstratethat an ensemble of non-interacting photo-ferroelectric NPs may exhibitsuperparaelectric-like features at the tricritical point, such as stronglyfrequency-dependent giant piezoelectric and dielectric responses, which canpotentially be exploited for piezoelectric applications.

Light-Induced Transitions of Polar State and Domain Morphology of Photo-Ferroelectric Nanoparticles