self_healing Photovoltaics Pinpoint PFM AtomicLayer Annealing strontiu_titanate Silicon mechanical_property Varistor Protein Spincast oxide_layer CancerCell Semiconductor CalciumHydroxyapatite Hexylthiophene atomic_layer Cobalt-dopedIronOxide Composite BiVO4 domain_switching SThM chemical_compound IVSpectroscopy FM_KPFM Tungsten Scratch high_resolution DOE PFM Filter KPFM Writing DLaTGS NUS_NNI_Nanocore