gallium_nitride fluorocarbon Formamidinium_lead_iodide ForceDistanceSpectroscopy ForceMapping Film ULCA align Phosphide molecule Optical Bismuth WS2 PVAP3HT Mapping Nanostructure MonoLayer Hysteresys LiNbO3 PinpointPFM Current BTO piezoelectric force microscopy FrictionForce Thermal MLCC Fluoride single_layer SelfAssembly Magnets FM_SKPM Lateral_Force_Microscopy Conductance LifeScience Styrene