NiFe PFM Lattice SolarCell SrTiO3 high_resolution self_assembly sputter ConductiveAFM self-assembled_monolayer Ferrite LiquidImaging Layer Sphere Fet Wafer HighResolution VerticalPFM OrganicSemiconductor Vinylpyridine SetpointMode Roughness Temasek_Lab Self-assembledMonolayer ScanningSpreadingResistanceMicroscopy Electrode DeoxyribonucleicAcid ConductingPolymer Pzt SrO Polyvinylidene_fluoride C_AFM Zhi temp_control Piezoresponse