Graphene SiliconCrystal PinpointPFM Formamidinium_lead_iodide PrCurve Conductivity Tapping MoirePattern MonoLayer TipBiasMode piezoelectric force microscopy temperature_control Bmp Dr.JurekSadowski PFM Praseodymium BiasMode LMF AdhesionForce Pattern 2-vinylpyridine DiffractiveOpticalElements HfO2 GalliumPhosphide PtfeMembrane molecule SingleLayer Organic SetpointMode Reading HexagonalBN Wang NusEce Sio2 Inorganic_Compound