PtfeMembrane Styrene Yttria_stabilized_Zirconia SmalScan Holes ScanningTunnelingMicroscopy LateralForce ScanningThermalMicroscopy mechanical property Photovoltaics SrO FAPbI3 Worcester_Polytechnic_Institute TriGlycineSulphate Piezoresponse Floppy PinpointNanomechanicalMode Sadowski FrictionalForce LiftHeight P3HT mono_layer ForceDistanceSpectroscopy GalliumPhosphide ULCA TemperatureControlledAFM Composite Singapore ForceVolumeImage PetruPoni fifber ThinFilm Boundary hard_disk Adhesive