Hexylthiophene TPU NtuEee HiVacuum atomic_steps FuelCell Dimethicone self-assembly Force-distance PetruPoni LowDensityPolyethylene Varistor Sperm SSRM BFO GaP ForceVolumeImage FM_KPFM Conductivity OpticalWaveguide I-VSpectroscopy light_emission NanoLithography Growth LateralPFM LifeScience Co/Cr/Pt nanomechanical STM Sidewall PhaseChange Battery ScratchMode doped Anneal