Patent ID: 11920257
Assignee: SUMCO CORPORATION
Field: Measurement (Instruments)
Classification: CPC C  G  H | IPC C  G  H

Claim 0:
1. A method of determining a cleaning condition of a member having a silicon carbide surface, the method comprising:
cleaning the silicon carbide surface under a candidate cleaning condition;
after the cleaning, evaluating a cleanliness of the member having the silicon carbide surface by a method comprising:
bringing the silicon carbide surface into contact with a mixed acid of hydrofluoric acid, hydrochloric acid, and nitric acid;
concentrating the mixed acid brought into contact with the silicon carbide surface by heating to obtain a concentrated liquid;
adding a solution to the concentrated liquid to obtain a sample solution;
performing quantitative analysis of metal components present in the sample solution by Inductively Coupled Plasma-Mass Spectrometry; and
evaluating the cleanliness of the member having the silicon carbide surface on the basis of a quantitative result of the metal components obtained by the quantitative analysis; and

determining that the candidate cleaning condition under which the cleanliness of the member having the silicon carbide surface has been evaluated to be within an allowable level is to be used as the cleaning condition of the member having the silicon carbide surface.