ScanningTunnelingMicroscopy Steps Gold Metal Photovoltaics AlkaneFilm ForceVolume 2d_materials ItoGlass BiVO4 CaMnO3 kelvin probe force microscopy Regensburg Indent Conductivity Polypropylene PinpointPFM Varistor KPFM Growing Heating Permalloy self_assembly Phosphide Vac Tapping AtomicSteps Dimethicone Galfenol SelfAssembly SKPM epitaxy Floppy PpLdpe MLCC