ScanningTunnelingMicroscopy Polyvinylidene sputter DiffractiveOpticalElements STO Collagen GaN Flake PolymerPatterns Magnetic Force Microscopy EFMAmplitude Vortex Formamidinium_lead_iodide align Piezoresponse Hexacontane heterojunctions Roughness Organic Foil Conduct Conductance FrictionForce AdhesionForce MESA structure PVA Sphere GaP Polarization Galfenol temperature controller AFM SolarCell optoelectronics Fujian Friction