HDD Polypropylene DOE Steps Piezo Cell PvdfFilm HBN Polyvinylidene biocompatible Fet EvatecAG Dopped Step heterojunctions Wildtype FM_SKPM NUSNNI ElectroDeposition EPFL PVAP3HT AtomicSteps Hexacontane ContactModeDots Hafnium_dioxide Workfunction PANI PpLdpe TPU Polarization ScanningKelvinProbeMicroscopy Bacterium Composite Metal-organicComplex Vacuum