Nonlinear vibration and stability of perovskite plates under multi-physics fields: Photothermal and photodielectric effects

Metal halide perovskites have attracted significant research interest in the fields of solar cells and optoelectronic devices. However, there are still many gaps in understanding their mechanical properties under multi-physics field conditions. This paper establishes an opto-electro-thermo-mechanical model for lead halide perovskite plates, accounting for photostriction, electrostriction, piezoelectricity, photothermal, and photodielectric effects, and investigates their nonlinear vibration, buckling, and postbuckling behaviors. The nonlinear governing equations are derived based on Mindlin-Reissner plate theory and von Kármán nonlinearity, and then numerically solved employing the differential quadrature method and direct iteration. Comprehensive parametric studies are conducted to explore the influence of multi-physics fields on the nonlinear vibration characteristics, buckling, and postbuckling behaviors of the perovskite plates. The numerical results demonstrate that the increase in light intensity and applied voltage leads to a decrease in nonlinear frequency, buckling load, and post-buckling equilibrium path, as well as an increase in the nonlinear frequency ratio. This suggests that a comprehensive understanding and incorporation of the opto-electro-thermo-mechanical multi-physics field effects in the analysis of perovskite structures is both essential and meaningful for the practical engineering applications of perovskites.