domain_switching GaN layers LeakageCurrent Tungsten_disulfide IVSpectroscopy BismuthVanadate KelvinProbeForceMicroscopy HexagonalBN Electronics Bio FM_SKPM HfO2 Pzt PiezoelectricForceMicroscopy Granada Composite Electrode BloodCell Copolymer Vacuum CrystalGrowing Polyvinylidene_fluoride NTU mechanical_property Adhesive Mechanical&nanotechnology SingleCrystal HexagonalBoronNitride InLiquid Deposition PinPointMode NUS_Physics INSPParis IMT_Bucharest