IMT_Bucharest Trench Workfunction align ElectrostaticForceMicroscopy food LaAlO3 Phenanthrene Organic China PtfeMembrane Calcium BiasMode cross section Dimethicone MESA structure Treatment Aluminum C60H122 Perovskite CalciumHydroxide Pattern SrTiO3 Gallium nanobar Hafnia Boron Sidewall Oxidation Sphere Annealing Iron Boundary GaN STM