Patent ID: 8610450

Claim:
A method of measuring a leakage current or a dielectric breakdown voltage of a semiconductor wafer that has a base wafer and a buffer layer formed on the base wafer, the method comprising: providing, on the buffer layer, a plurality of electrodes including a hole injection electrode made of a material that injects a hole into the buffer layer when an electric field is applied thereto; measuring an electric current flowing through a first pair of electrodes or a voltage generated between the electrodes of the first pair when a voltage or an electric current is applied to the first pair of electrodes, the first pair of electrodes being selected from the plurality of electrodes and including at least one hole injection electrode; and measuring a leakage current or a dielectric breakdown voltage caused by hole migration in the semiconductor wafer based on the current flowing through the first pair of electrodes or the voltage generated between the electrodes of the first pair.