MolybdenumDisulfide DOE Nickel Sperm AIN multi_layer LDPE gallium_nitride EFM Array ScanningSpreadingResistanceMicroscopy self-assembled_monolayer Zhi Organic ScanningKelvinProbeMicroscopy BismuthFerrite Tape Crystal Perovskite Photovoltaics Foil Global_Comm GaP phase_change solar_cell SolarCell LiBattery ElectrostaticForceMicroscopy tip_bias_mode Gallium Dental NiFe thermal_property MBE Hexylthiophene