Formamidinium_lead_iodide medical PinpointPFM lift_mode dielectric trench Bacterium ScanningTunnelingMicroscopy I-VSpectroscopy Copolymer molecular_self_assembly Polyvinylidene_fluoride GlassTemp PVAC Wildtype cannabinoid MoS2 PatternedSapphireSubstrat Christmas membrane TriGlycineSulphate ForceVolumeImage non_contact StyreneBeads PolymerBlend CeramicCapacitor Chungnam_National_University Dopped CP-AFM Film SICM MfmAmplitude ThinFilm LiftMode AtomicSteps Flake