piezoelectric force microscopy STM dielectric_trench atomic_steps Layer epitaxy Yttria_stabilized_Zirconia #EC MagneticForce TemperatureControllerAFM HighAcpectRatio SolarCell Optic Hexatriacontane MembraneFilter Ananth Ito multi_layer HBN DNA GaN Pinpoint PFM Hole NusEce KPFM BoronNitride ContactModeDot Semiconductor Aluminum Beads InLiquid GaP AlkaneFilm fe_nd_b PDMS