BiVO4 Formamidinium_lead_iodide IIT-chennai GaAs Polyimide Al2O3 KelvinProbeForceMicroscopy plastics FrictionalForceMicroscopy thermoplastic_elastomers thermal_property BoronNitride PolyvinylideneFluoride pulsed_laser_deposition Vac SingleCrystal dielectric trench Heating Hexatriacontane EFM HexagonalBN HanyangUniv Grain SurfaceChange SiWafer Pinpoint PFM Device MetalCompound Leakage Adhesive WS2 Croatia Polyurethane CuParticle CVD