AEAPDES Hole Hafnium_dioxide Tungsten Polyvinylidene_fluoride heterojunctions Ceramic Steps NUSNNI Piezoresponse Writing Worcester_Polytechnic_Institute HanyangUniv FM_KPFM silicon_oxide PVAP3HT Al2O3 Phthalocyanine self-assembly PhaseTransition Christmas Gold C_AFM piezoelectric force microscopy Granada Permalloy Thermoplastic_polyurethane Tin disulfide Reduction Etch I-VSpectroscopy BFO high_resolution SmalScan Melt