GranadaUniv semifluorinated_alkane Plug Device Optical TemperatureControllerAFM LDPE Ferroelectric Metal ScanningThermalMicroscopy TipBiasMode UnivCollegeLondon BismuthFerrite VerticalPFM PS_PVAC MBE Morphology Hexylthiophene gallium_nitride Materials Melt semifluorinated alkane Flake Wildtype solar_cell domain_switching bias_mode MagneticForce Calcite CalciumHydroxyapatite Defect PolyvinylAcetate Mobile chemical_compound PS_LDPE