vertical_PFM Potential CompactDisk Chemical Vapor Deposition Collagen NCM\ Optic Mechanical Display domain_switching Zhi LiNbO3 WS2 Hole light_emission Insulator Polyurethane Cross-section WWafer Hexatriacontane Chromium CNT ContactMode FFM layers Conductivity AlkaneFilm SiliconOxide FAPbI3 Oxidation Vacuum Mobile PvdfFilm AdhesionForce light_emitting