Phase ForceVolume GaN Lateral_Force_Microscopy AtomicSteps mechanical property PiezoelectricForceMicroscopy pulsed_laser_deposition YszSubstrate Heat LFM Holes AIN PolyvinylideneFluoride Mosfet Bacterium Christmas PinpointPFM PolyimideFilm Au111 Chrome PFM small_scan strontiu_titanate Temasek_Lab temperature_control Calcite semifluorinated alkane light_emitting ImideMonomer PvdfBead NUS_Physics doped PinPointMode solar_cell