molecular_self_assembly NanoLithography Logo PolycrystallineFerroelectricBCZT Memory Tape DeoxyribonucleicAcid Solar Polyvinylidene PvdfFilm HighResolution VerticalPFM MolybdenumDisulfide Nanostructure PhthalocyaninePraseodymium Array Aluminium_Oxide Molybdenum_disulfide Writing Floppy DiffractiveOpticalElements molecules OxideLayer TipBiasMode Melt PolyvinylideneFluoride SAM Force-distance DeflectionOptics SolarCell hetero_structure HfO2 plastic Temasek_Lab non_contact