layers Hexatriacontane LiftMode ThinFilm SKPM ContactModeDots epitaxy Gong Insulator PS_PVAC aluminum_nitride Reading semifluorinated_alkanes DomainSwitching Sio2 PANI PetruPoni tip_bias_mode I-VSpectroscopy Composite Optoelectronic Formamidinium_lead_iodide Thermal Ferroelectric HiVacuum Polymer CP-AFM SmalScan Switching BiFeO3 Chemical Vapor Deposition mechanical property Polyethylene Leakage Electronics