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kelvin probe force microscopy Pattern EvatecAG PolycrystallineFerroelectricBCZT MfmPhase Ptfe Electrode NCM HBN Butterfly Lift Polytetrafluoroethylene MeltingPoint Conductive AFM gallium_nitride SmalScan Dopped bias_mode ring shape Ito AM_SKPM Photovoltaics graphene_hybrid PMNPT Boundary Insulator Epoxy SiliconOxide Alkane SPMLabs Graphene Hafnia BismuthVanadate mechanical property SingleLayer