FM-KPFM solar_cell DataStorage HardDiskMedia FAPbI3 HexagonalBoronNitride C60H122 LiftHeight HydroGel CuSubstrate AEAPDES Lift PolyvinylAcetate IndiumTinOxide pinpoint mode PhaseTransition PMNPT Thermal BlockCopolymer SmalScan BTO Sapphire CopperFoil KelvinProbeForceMicroscopy ThermalDetectors TemperatureControllerStage Vinylpyridine Edwin Microchannel Topography DomainSwitching gallium_nitride CuFoil VerticalPFM mechanical property