FAPbI3 Terrace Al2O3 fluoroalkane Memory Hysteresys Oxidation PvdfFilm Vac Worcester_Polytechnic_Institute STO Growing Polyimide ThermalDetectors Switching IVSpectroscopy LateralPFM Glass semifluorinated_alkane Yeditepe chemical_compound exfoliate ScanningSpreadingResistanceMicroscopy optoelectronics Non-ContactMode Spincast CompactDisk ElectroDeposition Etch PinpointPFM C60H122 Nanostructure biocompatible India Butterfly