Electrical Characterization and Materials Stability Analysis of La2O3/HfO2 Composite Oxides on n-In0.53Ga0.47As MOS Capacitors With Different Annealing Temperatures

Abstract

In this letter, a high-k composite oxide composed of La2O3 and HfO2 is investigated for n-In0.53Ga0.47As metal-oxide-semiconductor (MOS) capacitor application. The composite oxide was formed by depositing five layers of La2O3 (0.8 nm)/HfO2(0.8 nm) on InGaAs with post deposition annealing at 500 degrees C. The MOS capacitors fabricated show good inversion behavior, high capacitance, low leakage current, with excellent interface trap density (D-it) of 7.0 x 10(11) cm(-2)eV(-1), small hysteresis of 200 mV and low capacitance equivalent thickness of 2.2 nm at 1 kHz were also achieved.