Capacitance-voltage characteristics of Al/Al2O3/p-GaAs metal-oxide-semiconductor diodes

Abstract
Metal‐oxide‐semiconductor (MOS) diodes were constructed on p‐type GaAs by means of anodic oxidation of aluminum film evaporated on GaAs. By terminating the oxidation precisely at the Al‐GaAs interface, MOS diodes in which the capacitance at low frequency increases in the positive‐bias region were obtained. The interface state density determined by using the Terman method based on 1‐MHz measurement of the CV characteristics is on the order of 1010 cm−2 eV−1.