The impact of in situ plasma-enhanced atomic layer deposition passivation on the electrical properties of HfO2/In0.53Ga0.47As metal–oxide–semiconductor capacitors (MOSCAPs) has been studied. Excellent interface quality of high-$k$ /III–V is achieved by aluminum nitride (AlN) interfacial passivation layer, including strong inversion behaviors and unpinned Fermi level. The band alignment of HfO2/AlN/In0.53Ga0.47As structure with the valence band offsets of 2.81 ± 0.1 eV and the conduction band offsets of 1.9 ± 0.1 eV was obtained. Better interface and optimized high-$k$ dielectric qualities are achieved using post remote-plasma treatment with either N2/H2 or NH3 gases. Sub-nanometer equivalent oxide thickness HfO2/AlN/In0.53Ga0.47As MOSCAPs with low interface trap density and low leakage current density have been characterized.
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