gallium_nitride PolycrystallineFerroelectricBCZT non_contact Hole food Alloy Solar HDD EFM sputter AIN Perovskite Led UTEM GaAs TCS CrAu Roughness Fluoride Grain kelvin probe force microscopy Steps AM_SKPM CBD Logo PolymerBlend Pattern CeramicCapacitor Corrosion LightEmiting dichalcogenide LiquidCell Defects ContactMode Composition