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

Claim 0:
1. 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; and
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,
wherein
the application control means has a function of varying the applied voltage, and
the evaluation means evaluates the state of the point defects at a location deep in a depth direction when the applied voltage is raised.