PvdfFilm NUS Polypropylene PiezoelectricForceMicroscopy Nanopattern ForceDistanceSpectroscopy Formamidinium_lead_iodide ImideMonomer lift_mode Switching Molybdenum gallium_nitride FFM SolarCell Corrosion temp Metal Pinpoint PFM Aluminium_Oxide Litho Crystal nanomechanical NusEce Holes NUS_NNI_Nanocore polyvinyl acetate Mfm University_of_Regensburg Hexatriacontane optoelectronics CVD fluoroaalkane Composite thermal_property LateralForceMicroscopy