Patent ID: 11906569
Assignee: SHOWA DENKO K.K.
Field: Surface technology, coating (Chemistry)
Classification: CPC G  C  H | IPC C  G  H

Claim 8:
9. A semiconductor wafer evaluation apparatus, comprising: a contact maker where a metal (Schottky electrode) liquefied at room temperature makes contact with a semiconductor wafer as an object to be evaluated; power supply means for applying a voltage to the contact maker via means for compensating for parasitic inductance and parasitic capacity; application control means for intermittently establishing an applied state of the voltage from the power supply means; evaluation means for evaluating a state of point defects of the semiconductor wafer based on a status of an electrostatic capacity of the semiconductor wafer during intermittent application of the voltage by the application control means; and photoirradiation means for performing irradiation with light having energy equal to or higher than a bandgap of the semiconductor wafer, and wherein the evaluation means evaluates the defects by minority carrier transient spectroscopy.