SolarCell Fet Microchannel P3HT Ptfe Dimethicone cross section Annealing SFAs Composition rubber TPU PolyvinylAcetate Chemical Vapor Deposition frequency_modulation ScanningKelvinProbeMicroscopy Floppy AM_KPFM Wildtype BismuthVanadate HACrystal temp LateralForceMicroscopy Fendb PiezoelectricForceMicroscopy Cancer plastic GaP atomic_layer LateralPFM BloodCell LithiumNiobate oxide_layer Subhajjit Sulfur