kelvin probe force microscopy SiliconCrystal LateralForceMicroscopy Current 2d_materials INSP Film HBN SSRM LiquidCrystal mono_layer IRDetector atomic_steps Phthalocyanine HexacontaneFilm doped Chemical Vapor Deposition SingleLayer Polystyrene Molybdenum Piezoresponse Neodymium MoS2 SoftSample PolyvinylideneFluoride EvatecAG ScratchMode Cross-section Spincast polymeric_arrays Beads Carbon mechanical property solar_cell Domain