STO flakes Iron WWafer Conductance PyroelectricDetector Cobalt Yeditepe_University Praseodymium CuParticle Potential IVSpectroscopy PolyvinylAcetate Plug Sio2 CNT Polyaniline NCM AM-KPFM Solar FFM graphene_hybrid Oxidation SSRM HafniumDioxide Ptfe TemperatureControlledAFM cooling FM_KPFM Spain Formamidinium_lead_iodide Alkane GaAs Copolymer Defects